How much does your phone’s blue light really delay your sleep? Relax, it’s just 2.7 minutes
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It’s one of the most pervasive messages about technology and sleep. We’re told bright, blue light from screens prevents us falling asleep easily. We’re told to avoid scrolling on our phones before bedtime or while in bed. We’re sold glasses to help filter out blue light. We put our phones on “night mode” to minimise exposure to blue light.
But what does the science actually tell us about the impact of bright, blue light and sleep? When our group of sleep experts from Sweden, Australia and Israel compared scientific studies that directly tested this, we found the overall impact was close to meaningless. Sleep was disrupted, on average, by less than three minutes.
We showed the message that blue light from screens stops you from falling asleep is essentially a myth, albeit a very convincing one.
Instead, we found a more nuanced picture about technology and sleep.
What we did
We gathered evidence from 73 independent studies with a total of 113,370 participants of all ages examining various factors that connect technology use and sleep.
We did indeed find a link between technology use and sleep, but not necessarily what you’d think.
We found that sometimes technology use can lead to poor sleep and sometimes poor sleep can lead to more technology use. In other words, the relationship between technology and sleep is complex and can go both ways.
How is technology supposed to harm sleep?
Technology is proposed to harm our sleep in a number of ways. But here’s what we found when we looked at the evidence:
- bright screen light – across 11 experimental studies, people who used a bright screen emitting blue light before bedtime fell asleep an average of only 2.7 minutes later. In some studies, people slept better after using a bright screen. When we were invited to write about this evidence further, we showed there is still no meaningful impact of bright screen light on other sleep characteristics including the total amount or quality of sleep
- arousal is a measure of whether people become more alert depending on what they’re doing on their device. Across seven studies, people who engaged in more alerting or “exciting” content (for example, video games) lost an average of only about 3.5 minutes of sleep compared to those who engaged in something less exciting (for example, TV). This tells us the content of technology alone doesn’t affect sleep as much as we think
- we found sleep disruption at night (for example, being awoken by text messages) and sleep displacement (using technology past the time that we could be sleeping) can lead to sleep loss. So while technology use was linked to less sleep in these instances, this was unrelated to being exposed to bright, blue light from screens before bedtime.
Which factors encourage more technology use?
Research we reviewed suggests people tend to use more technology at bedtime for two main reasons:
- to “fill the time” when they’re not yet sleepy. This is common for teenagers, who have a biological shift in their sleep patterns that leads to later sleep times, independent of technology use.
- to calm down negative emotions and thoughts at bedtime, for apparent stress reduction and to provide comfort.
There are also a few things that might make people more vulnerable to using technology late into the night and losing sleep.
We found people who are risk-takers or who lose track of time easily may turn off devices later and sacrifice sleep. Fear of missing out and social pressures can also encourage young people in particular to stay up later on technology.
What helps us use technology sensibly?
Last of all, we looked at protective factors, ones that can help people use technology more sensibly before bed.
The two main things we found that helped were self-control, which helps resist the short-term rewards of clicking and scrolling, and having a parent or loved one to help set bedtimes.
Why do we blame blue light?
The blue light theory involves melatonin, a hormone that regulates sleep. During the day, we are exposed to bright, natural light that contains a high amount of blue light. This bright, blue light activates certain cells at the back of our eyes, which send signals to our brain that it’s time to be alert. But as light decreases at night, our brain starts to produce melatonin, making us feel sleepy.
It’s logical to think that artificial light from devices could interfere with the production of melatonin and so affect our sleep. But studies show it would require light levels of about 1,000-2,000 lux (a measure of the intensity of light) to have a significant impact.
Device screens emit only about 80-100 lux. At the other end of the scale, natural sunlight on a sunny day provides about 100,000 lux.
What’s the take-home message?
We know that bright light does affect sleep and alertness. However our research indicates the light from devices such as smartphones and laptops is nowhere near bright or blue enough to disrupt sleep.
There are many factors that can affect sleep, and bright, blue screen light likely isn’t one of them.
The take-home message is to understand your own sleep needs and how technology affects you. Maybe reading an e-book or scrolling on socials is fine for you, or maybe you’re too often putting the phone down way too late. Listen to your body and when you feel sleepy, turn off your device.
Chelsea Reynolds, Casual Academic/Clinical Educator and Clinical Psychologist, College of Education, Psychology and Social Work, Flinders University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Quick Healthy Recipe Ideas
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It’s Q&A Day at 10almonds!
Have a question or a request? You can always hit “reply” to any of our emails, or use the feedback widget at the bottom!
In cases where we’ve already covered something, we might link to what we wrote before, but will always be happy to revisit any of our topics again in the future too—there’s always more to say!
As ever: if the question/request can be answered briefly, we’ll do it here in our Q&A Thursday edition. If not, we’ll make a main feature of it shortly afterwards!
So, no question/request too big or small
“It was superb !! Just loved that healthy recipe !!! I would love to see one of those every day, if possible !! Keep up the fabulous work !!! ”
We’re glad you enjoyed! We can’t promise a recipe every day, but here’s one just for you:
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Water Bath + More Cookbook for Beginners – by Sarah Roslin
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Whether you want to be prepared for the next major crisis that shuts down food supply chains, or just learn a new skill, this book provides the tools!
Especially beneficial if you also grow your own vegetables, but even you just buy those… Home-canned food is healthy, contains fewer additives and preservatives, and costs less in the long run.
Roslin teaches an array of methods, including most importantly:
- fermentation and pickling
- water bath canning, and
- pressure canning.
As for what’s inside? She covers not just vegetables, but also fruit, seafood, meat… Basically, anything that can be canned.
The book explains the tools and equipment you will need as well as how to perform it safely—as well as common mistakes to avoid!
Lest we be intimidated by the task of acquiring appropriate equipment, she also walks us through what we’ll need in that regard too!
Last but not least, there’s also a (sizeable) collection of simple, step-by-step recipes, catering to a wide variety of tastes.
Bottom line: a highly valuable resource that we recommend heartily.
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How To Reduce The Harm Of Festive Drinking (Without Abstaining)
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How To Reduce The Harm Of Festive Drinking
Not drinking alcohol is—of course—the best way to avoid the harmful effects of alcohol. However, not everyone wants to abstain, especially at this time of year, so today we’re going to be focusing on harm reduction without abstinence.
If you do want to quit (or even reduce) drinking, you might like our previous article about that:
For everyone else, let’s press on with harm reduction:
Before You Drink
A common (reasonable, but often unhelpful) advice is “set yourself a limit”. The problem with this is that when we’re sober, “I will drink no more than n drinks” is easy. After the first drink, we start to feel differently about it.
So: delay your first drink of the day for as long as possible
That’s it, that’s the tip. The later you start drinking, not only will you likely drink less, but also, your liver will have had longer to finish processing whatever you drank last night, so it’s coming at the new drink(s) fresh.
On that note…
Watch your meds! Often, especially if we are taking medications that also tax our liver (acetaminophen / paracetamol / Tylenol is a fine example of this), we are at risk of having a bit of a build-up, like an office printer that still chewing on the last job while you’re trying to print the next.
Additionally: do indeed eat before you drink.
While You Drink
Do your best to drink slowly. While this can hit the same kind of problem as the “set yourself a limit” idea, in that once you start drinking you forget to drink slowly, it’s something to try for.
If your main reason for drinking is the social aspect, then merely having a drink in your hand is generally sufficient. You don’t need to be keeping pace with anyone.
It is further good to alternate your drinks with water. As in, between each alcoholic drink, have a glass of water. This helps in several ways:
- Hydrates you, which is good for your body’s recovery abilities
- Halves the amount of time you spend drinking
- Makes you less thirsty; it’s easy to think “I’m thirsty” and reach for an alcoholic drink that won’t actually help. So, it may slow down your drinking for that reason, too.
At the dinner table especially, it’s very reasonable to have two glasses, one filled with water. Nobody will be paying attention to which glass you drink from more often.
After You Drink
Even if you are not drunk, assume that you are.
Anything you wouldn’t let a drunk person in your care do, don’t do. Now is not the time to drive, have a shower, or do anything you wouldn’t let a child do in the kitchen.
Hospital Emergency Rooms, every year around this time, get filled up with people who thought they were fine and then had some accident.
The biggest risks from alcohol are:
- Accidents
- Heart attacks
- Things actually popularly associated with alcohol, e.g. alcohol poisoning etc
So, avoiding accidents is as important as, if not more important than, avoiding damage to your liver.
Drink some water, and eat something.
Fruit is great, as it restocks you on vitamins, minerals, and water, while being very easy to digest.
Go to bed.
There is a limit to how much trouble you can get into there. Sleep it off.
In the morning, do not do “hair of the dog”; drinking alcohol will temporarily alleviate a hangover, but only because it kicks your liver back into an earlier stage of processing the alcohol—it just prolongs the inevitable.
Have a good breakfast, instead. Remember, fruit is your friend (as explained above).
Want to know more?
Here’s a great service with a lot of further links to a lot more resources:
With You | How to safely detox from alcohol at home
Take care!
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When should you get the updated COVID-19 vaccine?
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Updated COVID-19 vaccines are now available: They’re meant to give you the best protection against the strain of the virus that is making people severely sick and also causing deaths.
Many people were infected during the persistent summer wave, which may leave you wondering when you should get the updated vaccine. The short answer is that it depends on when you last got infected or vaccinated and on your particular level of risk.
We heard from six experts—including medical doctors and epidemiologists—about when they recommend getting an updated vaccine. Read on to learn what they said. And to make it easy, check out the flowchart below.
A flowchart to help you decide when is the best time to get the 2024-2025 updated COVID-19 vaccine. If I was infected with COVID-19 this summer, when should I get the updated vaccine?
All the experts we spoke to agreed that if you were infected this summer, you should wait at least three months since you were infected to get vaccinated.
“Generally, an infection may be protective for about three months,” Dr. Ziyad Al-Aly, chief of research and development at the Veterans Affairs St. Louis Health Care System, tells PGN. “If they got infected three or more months ago, it is a good idea to get vaccinated sooner than later.”
This three-month rule applies if you got vaccinated over the summer, which may be the case for some immunocompromised people, adds Dr. Peter Chin-Hong, professor of medicine at the University of California, San Francisco.
If I didn’t get infected with COVID-19 this summer, when should I get vaccinated?
Most of the experts we talked to say that if you didn’t get infected with COVID-19 this summer, you should get the vaccine as soon as possible. Dr. Peter Hotez, dean of the National School of Tropical Medicine at Baylor College of Medicine, emphasizes that if this applies to you, you should get vaccinated as soon as possible, especially given the current COVID-19 surge.
Al-Aly agrees. “Vaccine-derived immunity lasts for several months, and it should cover the winter season. Plus, the current vaccine is a KP.2-adapted vaccine, so it will work most optimally against KP.2 and related subvariants [such as] KP.3 that are circulating now,” Al-Aly says. “We don’t know when the virus will mutate to a variant that is not compatible with the KP.2 vaccine.”
Al-Aly adds that if you’d rather take the protection you can get right now, “It may make more sense to get vaccinated sooner than later.”
This especially applies if you’re over 65 or immunocompromised and you haven’t received a COVID-19 vaccine in a year or more because, as Chin-Hong adds, “that is the group that is being hospitalized and disproportionately dying now.”
Some experts—including epidemiologist Katelyn Jetelina, author of newsletter Your Local Epidemiologist—also say that if you’re younger than 65 and not immunocompromised, you can consider waiting and aiming to get vaccinated before Halloween to get the best protection in the winter, when we’re likely to experience another wave because of the colder weather, gathering indoors, and the holidays.
“I am more worried about the winter than the summer, so I would think of October (some time before Halloween) as the ‘Goldilocks moment’—not too early, not too late, but just right,” Chin-Hong adds. Time it “such that your antibodies peak during the winter when COVID-19 cases are expected to exceed what we are seeing this summer.”
My children are starting school—should I get them vaccinated now?
According to most experts we spoke to, now is a good time to get your children vaccinated.
Jennifer Nuzzo, professor of epidemiology and director of the Pandemic Center at the Brown University School of Public Health, adds that “with COVID-19 infection levels as high as they are and increased exposures in school,” now is a particularly good time to get an updated vaccine if people haven’t gotten COVID-19 recently.
Additionally, respiratory viruses spike when kids are back in school, so “doing everything you can to reduce your child’s risk of infection can help protect families and communities,” says epidemiologist Jessica Malaty Rivera, science communications advisor at the de Beaumont Foundation.
For more information, talk to your health care provider.
(Disclosure: The de Beaumont Foundation is a partner of The Public Good Projects, the organization that owns Public Good News.)
This article first appeared on Public Good News and is republished here under a Creative Commons license.
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Optimism Seriously Increases Longevity!
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Always look on the bright side for life
❝I’m not a pessimist; I’m a realist!❞
~ every pessimist ever
To believe self-reports, the world is divided between optimists and realists. But how does your outlook measure up, really?
Below, we’ve included a link to a test, and like most free online tests, this is offered “as-is” with the usual caveats about not being a clinical diagnostic tool, this one actually has a fair amount of scientific weight behind it:
❝Empirical testing has indicated the validity of the Optimism Pessimism Instrument as published in the scientific journal Current Psychology: Research and Reviews.
The IDRlabs Optimism/Pessimism Test (IDR-OPT) was developed by IDRlabs. The IDR-OPT is based on the Optimism/Pessimism Instrument (OPI) developed by Dr. William Dember, Dr. Stephanie Martin, Dr. Mary Hummer, Dr. Steven Howe, and Dr. Richard Melton, at the University of Cincinnati.❞
Take This Short (1–2 mins) Test
How did you score? And what could you do to improve on that score?
We said before that we’d do a main feature on this sometime, and today’s the day! Fits with the theme of Easter too, as for those who observe, this is a time for a celebration of hope, new beginnings, and life stepping out of the shadows.
On which note, before we go any further, let’s look at a very big “why” of optimism…
There have been many studies done regards optimism and health, and they generally come to the same conclusion: optimism is simply good for the health.
Here’s an example. It’s a longitudinal study, and it followed 121,700 women (what a sample size!) for eight years. It controlled for all kinds of other lifestyle factors (especially smoking, drinking, diet, and exercise habits, as well as pre-existing medical conditions), so this wasn’t a case of “people who are healthy are more optimistic as a result. And, in the researchers’ own words…
❝We found strong and statistically significant associations of increasing levels of optimism with decreasing risks of mortality, including mortality due each major cause of death, such as cancer, heart disease, stroke, respiratory disease, and infection.
Importantly, findings were maintained after close control for potential confounding factors, including sociodemographic characteristics and depression❞
Read: Optimism and Cause-Specific Mortality: A Prospective Cohort Study
So that’s the why. Now for the how…
Positive thinking is not what you think it is
A lot of people think of “think positive thoughts” as a very wishy-washy platitude, but positive thinking isn’t about ignoring what’s wrong, or burying every negative emotion.
Rather, it is taking advantage of the basic CBT, DBT, and, for that matter, NLP principles:
- Our feelings are driven by our thoughts
- Our thoughts can be changed by how we frame things
This is a lot like the idea that “there’s not such thing as bad weather; only the wrong clothes”. Clearly written by someone who’s never been in a hurricane, but by and large, the principle stands true.
For example…
- Most problems can be reframed as opportunities
- Replace “I have to…” with “I get to…”
- Will the task be arduous? It’ll be all the better looking back on it.
- Did you fail abjectly? Be proud that you lived true to your values anyway.
A lot of this is about focusing on what you can control. If you live your life by your values (first figure out what they are, if you haven’t already), then that will become a reassuring thing that you can always count on, no matter what.
Practice positive self-talk (eliminate the negative)
We often learn, usually as children, to be self deprecatory so as to not appear immodest. While modesty certainly has its place, we don’t have to trash ourselves to do that!
There are various approaches to this, for example:
- Replacing a self-criticism (whether it was true or not) with a neutral or positive statement that you know is true. “I suck at xyz” is just putting yourself down, “Xyz is a challenge for me” asks the question, how will you rise to it?
- Replacing a self-criticism with irony. It doesn’t matter how dripping with sarcasm your inner voice is, the words will still be better. “Glamorous as ever!” after accidentally putting mascara in your eye. “So elegant and graceful!” after walking into furniture. And so on.
Practice radical acceptance
This evokes the “optimistic nihilism” approach to life. It’s perhaps not best in all scenarios, but if you’re consciously and rationally pretty sure something is going to be terrible (and/or know it’s completely outside of your control), acknowledging that possibility (or even, likelihood) cheerfully. Borrowing from the last tip, this can be done with as much irony as you find necessary. For example:
Facing a surgery the recovery from which you know categorically will be very painful: with a big smile “Yep, I am going to be in a lot of pain, so that’s going to be fun!” (fun fact: psychological misery will not make the physical pain any less painful, so you might as well see the funny side) ← see link for additional benefits laughter can add to health-related quality of life)
Plan for the future with love
You know the whole “planting trees in whose shade you’ll never sit”, thing, but: actually for yourself too. Plan (and act!) now, out of love and compassion for your future self.
Simple example: preparing (or semi-preparing, if appropriate) breakfast for yourself the night before, when you know in the morning you’ll be tired, hungry, and/or pressed for time. You’ll wake up, remember that you did that, and…
Tip: at moments like that, take a moment to think “Thanks, past me”. (Or call yourself by your name, whatever works for you. For example I, your writer here, might say to myself “Thanks, past Nastja!”)
This helps to build a habit of gratitude for your past self and love for your future self.
This goes for little things like the above, but it also goes for things whereby there’s much longer-term delayed gratification, such as:
- Healthy lifestyle changes (usually these see slow, cumulative progress)
- Good financial strategies (usually these see slow, cumulative progress)
- Long educational courses (usually these see slow, cumulative progress)
Basically: pay it forward to your future self, and thank yourself later!
Some quick ideas of systems and apps that go hard on the “long slow cumulative progress” approach that you can look back on with pride:
- Noom—nutritional program with a psychology-based approach to help you attain and maintain your goals, long term
- You Need A Budget—we’ve recommended it before and we’ll recommend it again. This is so good. If you click through, you can see a short explanation of what makes it so different to other budgeting apps.
- Duolingo—the famously persistence-motivational language learning app
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Hospitals worldwide are short of saline. We can’t just switch to other IV fluids – here’s why
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Last week, the Australian Therapeutic Goods Administration added intravenous (IV) fluids to the growing list of medicines in short supply. The shortage is due to higher-than-expected demand and manufacturing issues.
Two particular IV fluids are affected: saline and compound sodium lactate (also called Hartmann’s solution). Both fluids are made with salts.
There are IV fluids that use other components, such as sugar, rather than salt. But instead of switching patients to those fluids, the government has chosen to approve salt-based solutions by other overseas brands.
So why do IV fluids contain different chemicals? And why can’t they just be interchanged when one runs low?
Pavel Kosolapov/Shutterstock We can’t just inject water into a vein
Drugs are always injected into veins in a water-based solution. But we can’t do this with pure water, we need to add other chemicals. That’s because of a scientific principle called osmosis.
Osmosis occurs when water moves rapidly in and out of the cells in the blood stream, in response to changes to the concentration of chemicals dissolved in the blood plasma. Think salts, sugars, nutrients, drugs and proteins.
Too high a concentration of chemicals and protein in your blood stream leads it to being in a “hypertonic” state, which causes your blood cells to shrink. Not enough chemicals and proteins in your blood stream causes your blood cells to expand. Just the right amount is called “isotonic”.
Mixing the drug with the right amount of chemicals, via an injection or infusion, ensures the concentration inside the syringe or IV bag remains close to isotonic.
Australia is currently short on two salt-based IV fluids. sirnength88/Shutterstock What are the different types of IV fluids?
There are a range of IV fluids available to administer drugs. The two most popular are:
- 0.9% saline, which is an isotonic solution of table salt. This is one of the IV fluids in short supply
- a 5% solution of the sugar glucose/dextrose. This fluid is not in short supply.
There are also IV fluids that combine both saline and glucose, and IV fluids that have other salts:
- Ringer’s solution is an IV fluid which has sodium, potassium and calcium salts
- Plasma-Lyte has different sodium salts, as well as magnesium
- Hartmann’s solution (compound sodium lactate) contains a range of different salts. It is generally used to treat a condition called metabolic acidosis, where patients have increased acid in their blood stream. This is in short supply.
What if you use the wrong solution?
Some drugs are only stable in specific IV fluids, for instance, only in salt-based IV fluids or only in glucose.
Putting a drug into the wrong IV fluid can potentially cause the drug to “crash out” of the solution, meaning patients won’t get the full dose.
Or it could cause the drug to decompose: not only will it not work, but it could also cause serious side effects.
An example of where a drug can be transformed into something toxic is the cancer chemotherapy drug cisplatin. When administered in saline it is safe, but administration in pure glucose can cause life-threatening damage to a patients’ kidneys.
What can hospitals use instead?
The IV fluids in short supply are saline and Hartmann’s solution. They are provided by three approved Australian suppliers: Baxter Healthcare, B.Braun and Fresenius Kabi.
The government’s solution to this is to approve multiple overseas-registered alternative saline brands, which they are allowed to do under current legislation without it going through the normal Australian quality checks and approval process. They will have received approval in their country of manufacture.
The government is taking this approach because it may not be effective or safe to formulate medicines that are meant to be in saline into different IV fluids. And we don’t have sufficient capacity to manufacture saline IV fluids here in Australia.
The Australian Society of Hospital Pharmacists provides guidance to other health staff about what drugs have to go with which IV fluids in their Australian Injectable Drugs Handbook. If there is a shortage of saline or Hartmann’s solution, and shipments of other overseas brands have not arrived, this guidance can be used to select another appropriate IV fluid.
Why don’t we make it locally?
The current shortage of IV fluids is just another example of the problems Australia faces when it is almost completely reliant on its critical medicines from overseas manufacturers.
Fortunately, we have workarounds to address the current shortage. But Australia is likely to face ongoing shortages, not only for IV fluids but for any medicines that we rely on overseas manufacturers to produce. Shortages like this put Australian lives at risk.
In the past both myself, and others, have called for the federal government to develop or back the development of medicines manufacturing in Australia. This could involve manufacturing off-patent medicines with an emphasis on those medicines most used in Australia.
Not only would this create stable, high technology jobs in Australia, it would also contribute to our economy and make us less susceptible to future global drug supply problems.
Nial Wheate, Professor and Director Academic Excellence, Macquarie University and Shoohb Alassadi, Casual academic, pharmaceutical sciences, University of Sydney
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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