Could Just Two Hours Sleep Per Day Be Enough?
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Polyphasic Sleep… Super-Schedule Or An Idea Best Put To Rest?
What is it?
Let’s start by defining some terms:
- Monophasic sleep—sleeping in one “chunk” per day. For example, a good night’s “normal” sleep.
- Biphasic sleep—sleeping in two “chunks” per day. Typically, a shorter night’s sleep, with a nap usually around the middle of the day / early afternoon.
- Polyphasic sleep—sleeping in two or more “chunks per day”. Some people do this in order to have more hours awake per day, to do things. The idea is that sleeping this way is more efficient, and one can get enough rest in less time. The most popular schedules used are:
- The Überman schedule—six evenly-spaced 20-minute naps, one every four hours, throughout the 24-hour day. The name is a semi-anglicized version of the German word Übermensch, “Superman”.
- The Everyman schedule—a less extreme schedule, that has a three-hours “long sleep” during the night, and three evenly-spaced 20-minute naps during the day, for a total of 4 hours sleep.
There are other schedules, but we’ll focus on the most popular ones here.
Want to learn about the others? Visit: Polyphasic.Net (a website by and for polyphasic sleep enthusiasts)
Some people have pointed to evidence that suggests humans are naturally polyphasic sleepers, and that it is only modern lifestyles that have forced us to be (mostly) monophasic.
There is at least some evidence to suggest that when environmental light/dark conditions are changed (because of extreme seasonal variation at the poles, or, as in this case, because of artificial changes as part of a sleep science experiment), we adjust our sleeping patterns accordingly.
The counterpoint, of course, is that perhaps when at the mercy of long days/nights at the poles, or no air-conditioning to deal with the heat of the day in the tropics, that perhaps we were forced to be polyphasic, and now, with modern technology and greater control, we are free to be monophasic.
Either way, there are plenty of people who take up the practice of polyphasic sleep.
Ok, But… Why?
The main motivation for trying polyphasic sleep is simply to have more hours in the day! It’s exciting, the prospect of having 22 hours per day to be so productive and still have time over for leisure.
A secondary motivation for trying polyphasic sleep is that when the brain is sleep-deprived, it will prioritize REM sleep. Here’s where the Überman schedule becomes perhaps most interesting:
The six evenly-spaced naps of the Überman schedule are each 20 minutes long. This corresponds to the approximate length of a normal REM cycle.
Consequently, when your head hits the pillow, you’ll immediately begin dreaming, and at the end of your dream, the alarm will go off.
Waking up at the end of a dream, when one hasn’t yet entered a non-REM phase of sleep, will make you more likely to remember it. Similarly, going straight into REM sleep will make you more likely to be aware of it, thus, lucid dreaming.
Read: Sleep fragmentation and lucid dreaming (actually a very interesting and informative lucid dreaming study even if you don’t want to take up polyphasic sleep)
Six 20-minute lucid-dreaming sessions per day?! While awake for the other 22 hours?! That’s… 24 hours per day of wakefulness to use as you please! What sorcery is this?
Hence, it has quite an understandable appeal.
Next Question: Does it work?
Can we get by without the other (non-REM) kinds of sleep?
According to Überman cycle enthusiasts: Yes! The body and brain will adapt.
According to sleep scientists: No! The non-REM slow-wave phases of sleep are essential
Read: Adverse impact of polyphasic sleep patterns in humans—Report of the National Sleep Foundation sleep timing and variability consensus panel
(if you want to know just how bad it is… the top-listed “similar article” is entitled “Suicidal Ideation”)
But what about, for example, the Everman schedule? Three hours at night is enough for some non-REM sleep, right?
It is, and so it’s not as quickly deleterious to the health as the Überman schedule. But, unless you are blessed with rare genes that allow you to operate comfortably on 4 hours per day (you’ll know already if that describes you, without having to run any experiment), it’s still bad.
Adults typically need 7–9 hours of sleep per night, and if you don’t get it, you’ll accumulate a sleep debt. And, importantly:
When you accumulate sleep debt, you are borrowing time at a very high rate of interest!
And, at risk of laboring the metaphor, but this is important too:
Not only will you have to pay it back soon (with interest), you will be hounded by the debt collection agents—decreased cognitive ability and decreased physical ability—until you pay up.
In summary:
- Polyphasic sleep is really very tempting
- It will give you more hours per day (for a while)
- It will give the promised lucid dreaming benefits (which is great until you start micronapping between naps, this is effectively a mini psychotic break from reality lasting split seconds each—can be deadly if behind the wheel of a car, for instance!)
- It is unequivocally bad for the health and we do not recommend it
Bottom line:
Some of the claimed benefits are real, but are incredibly short-term, unsustainable, and come at a cost that’s far too high. We get why it’s tempting, but ultimately, it’s self-sabotage.
(Sadly! We really wanted it to work, too…)
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How we can prepare for future public health emergencies
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The U.S. is experiencing an increasing number of disease outbreaks and extreme weather events. While state and national preparedness for public health emergencies has improved in some areas, dangerous gaps remain, says a recent report from Trust for America’s Health.
Titled, “Ready or Not 2024: Protecting the Public’s Health from Diseases, Disasters, and Bioterrorism,” the report identifies gaps in national and state preparedness for public health emergencies and provides recommendations for improvement.
Using nine key indicators, the report categorizes all U.S. states and the District of Columbia into three readiness levels: high, medium, and low. The writers hope the report will help policymakers in under-performing states improve public health infrastructure.
Read on to learn more about what the research found and how we can individually prepare for future public health emergencies.
There’s work to be done
The report highlights areas with strong performance as well as those that need improvement.
Some areas with strong performance:
- State public health funding: Most states and the District of Columbia either maintained or increased their public health funding during the 2023 fiscal year.
- Health care labor force preparedness: Most states have started expanding the health care labor force for improved emergency response. As of 2023, 39 states participated in the Nurse Licensure Compact, which allows nurses to work in multiple member states without the need for additional state licenses.
Some areas that need improvement:
- Hospital safety scores: Only 25 percent of acute care hospitals earned the highest patient safety grade in fall 2023. These scores measure health care-associated infection rates, intensive care unit capacity, and other metrics. More high-scoring hospitals would improve preparedness for future public health emergencies.
- Access to paid time off: From March 2018 to March 2023, only 55 percent of U.S. workers used paid time off. Access to paid time off is important for reducing the spread of infectious diseases.
We can all do our part by staying up to date on vaccines
While the report focuses on policy changes that would improve emergency preparedness, Trust for America’s Health’s research identifies one way that we can individually prepare for future public health emergencies: staying up to date on vaccines.
The report found that during the 2022-2023 flu season, only 49 percent of those eligible for the flu vaccine received it. Public health experts are concerned that false claims about COVID-19 vaccines have resulted in overall vaccine hesitancy.
A decline in vaccination rates has led to an uptick in life-threatening, vaccine-preventable diseases, such as measles. Increasing vaccine uptake would prevent the spread of vaccine-preventable diseases and reduce strain on hospital systems during public health crises.
Make sure that you and your children have received all recommended vaccines to prevent severe illness, hospitalization, and death. Learn more about recommended vaccines for adults and children from the CDC.
For more information, talk to your health care provider.
This article first appeared on Public Good News and is republished here under a Creative Commons license.
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Shredded Wheat vs Organic Crunch – Which is Healthier?
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Our Verdict
When comparing Shredded Wheat to Organic Crunch, we picked the Shredded Wheat.
Why?
In this battle of the cereals, it comes down to the ingredients:
- The Shredded Wheat cereal has two ingredients: wheat (shredded), and BHT. The latter is a phenolic compound and antioxidant.
- The Organic Crunch cereal has lots of ingredients, of which the first two are wheat flour, and sugar.
This means that, per serving…
- The Shredded Wheat cereal has 7g fiber and 0g sugar
- The Organic Crunch cereal has 3g fiber and 12g sugar
Quite a difference! Sometimes, the “Organic Crunch” of a product comes from crunchy sugar.
You can check them out side-by-side here:
Shredded Wheat | Organic Crunch
Want to know more?
There’s a popular view that the only way to get fiber is to eat things that look (and potentially taste) like cardboard. Not so! There are delicious options:
Level-Up Your Fiber Intake! (Without Difficulty Or Discomfort)
Enjoy!
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Soap vs Sanitizer – Which is Healthier?
10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.
Our Verdict
When comparing soap to sanitizer, we picked the soap.
Why?
Both are good at killing bacteria / inactivating viruses, but there are several things that set them apart:
- Soap doesn’t just kill them; it slides them off and away down the drain. That means that any it failed to kill are also off and down the drain, not still on your hands. This is assuming good handwashing technique, of course!
- Sanitizer gel kills them, but can take up to 4 minutes of contact to do so. Given that people find 20 seconds of handwashing laborious, 240 seconds of sanitizer gel use seems too much to hope for.
Both can be dehydrating for the hands; both can have ingredients added to try to mitigate that.
We recommend a good (separate) moisturizer in either case, but the point is, the dehydration factor doesn’t swing it far either way.
So, we’ll go with the one that gets rid of the germs the most quickly: the soap
10almonds tip: splash out on the extra-nice hand-soaps for your home—this will make you and others more likely to wash your hands more often! Sometimes, making something a more pleasant experience makes all the difference.
Want to know more?
Check out:
Take care!
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Want to sleep longer? Adding mini-bursts of exercise to your evening routine can help – new study
10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.
Exercising before bed has long been discouraged as the body doesn’t have time to wind down before the lights go out.
But new research has found breaking up a quiet, sedentary evening of watching television with short bursts of resistance exercise can lead to longer periods of sleep.
Adults spend almost one third of the 24-hour day sleeping. But the quality and length of sleep can affect long-term health. Sleeping too little or waking often in the night is associated with an increased risk of heart disease and diabetes.
Physical activity during the day can help improve sleep. However, current recommendations discourage intense exercise before going to bed as it can increase a person’s heart rate and core temperature, which can ultimately disrupt sleep.
Nighttime habits
For many, the longest period of uninterrupted sitting happens at home in the evening. People also usually consume their largest meal during this time (or snack throughout the evening).
Insulin (the hormone that helps to remove sugar from the blood stream) tends to be at a lower level in the evening than in the morning.
Together these factors promote elevated blood sugar levels, which over the long term can be bad for a person’s health.
Our previous research found interrupting evening sitting every 30 minutes with three minutes of resistance exercise reduces the amount of sugar in the bloodstream after eating a meal.
But because sleep guidelines currently discourage exercising in the hours before going to sleep, we wanted to know if frequently performing these short bursts of light activity in the evening would affect sleep.
Activity breaks for better sleep
In our latest research, we asked 30 adults to complete two sessions based in a laboratory.
During one session the adults sat continuously for a four-hour period while watching streaming services. During the other session, they interrupted sitting by performing three minutes of body-weight resistance exercises (squats, calf raises and hip extensions) every 30 minutes.
After these sessions, participants went home to their normal life routines. Their sleep that evening was measured using a wrist monitor.
Our research found the quality of sleep (measured by how many times they woke in the night and the length of these awakenings) was the same after the two sessions. But the night after the participants did the exercise “activity breaks” they slept for almost 30 minutes longer.
Identifying the biological reasons for the extended sleep in our study requires further research.
But regardless of the reason, if activity breaks can extend sleep duration, then getting up and moving at regular intervals in the evening is likely to have clear health benefits.
Time to revisit guidelines
These results add to earlier work suggesting current sleep guidelines, which discourage evening exercise before bed, may need to be reviewed.
As the activity breaks were performed in a highly controlled laboratory environment, future research should explore how activity breaks performed in real life affect peoples sleep.
We selected simple, body-weight exercises to use in this study as they don’t require people to interrupt the show they may be watching, and don’t require a large space or equipment.
If people wanted to incorporate activity breaks in their own evening routines, they could probably get the same benefit from other types of exercise. For example, marching on the spot, walking up and down stairs, or even dancing in the living room.
The key is to frequently interrupt evening sitting time, with a little bit of whole-body movement at regular intervals.
In the long run, performing activity breaks may improve health by improving sleep and post-meal blood sugar levels. The most important thing is to get up frequently and move the body, in a way the works best for a person’s individual household.
Jennifer Gale, PhD candidate, Department of Human Nutrition, University of Otago and Meredith Peddie, Senior Lecturer, Department of Human Nutrition, University of Otago
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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The Brain-Gut Highway: A Two-Way Street
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The Brain-Gut Two-Way Highway
This is Dr. Emeran Mayer. He has the rather niche dual specialty of being a gastroenterologist and a neurologist. He has published over 353 peer reviewed scientific articles, and he’s a professor in the Departments of Medicine, Physiology, and Psychiatry at UCLA. Much of his work has been pioneering medical research into gut-brain interactions.
We know the brain and gut are connected. What else does he want us to know?
First, that it is a two-way interaction. It’s about 90% “gut tells the brain things”, but it’s also 10% “brain tells the gut things”, and that 10% can make more like a 20% difference, if for example we look at the swing between “brain using that 10% communication to tell gut to do things worse” or “brain using that 10% communication to tell gut to do things better”, vs the midpoint null hypothesis of “what the gut would be doing with no direction from the brain”.
For example, if we are experiencing unmanaged chronic stress, that is going to tell our gut to do things that had an evolutionary advantage 20,000–200,000 years ago. Those things will not help us now. We do not need cortisol highs and adrenal dumping because we ate a piece of bread while stressed.
Read more (by Dr. Mayer): The Stress That Evolution Has Not Prepared Us For
With this in mind, if we want to look after our gut, then we can start before we even put anything in our mouths. Dr. Mayer recommends managing stress, anxiety, and depression from the head downwards as well as from the gut upwards.
Here’s what we at 10almonds have written previously on how to manage those things:
- No-Frills, Evidence-Based Mindfulness
- How To Set Anxiety Aside
- The Mental Health First-Aid You’ll Hopefully Never Need
Do eat for gut health! Yes, even if…
Unsurprisingly, Dr. Mayer advocates for a gut-friendly, anti-inflammatory diet. We’ve written about these things before:
…but there’s just one problem:
For some people, such as with IBS, Crohn’s, and colitis, the Mediterranean diet that we (10almonds and Dr. Mayer) generally advocate for, is inaccessible. If you (if you have those conditions) eat as we describe, a combination of the fiber in many vegetables and the FODMAPs* in many fruits, will give you a very bad time indeed.
*Fermentable Oligo-, Di-, Monosaccharides And Polyols
Dr. Mayer has the answer to this riddle, and he’s not just guessing; he and his team did science to it. In a study with hundreds of participants, he measured what happened with adherence (or not) to the Mediterranean diet (or modified Mediterranean diet) (or not), in participants with IBS (or not).
The results and conclusions from that study included:
❝Among IBS participants, a higher consumption of fruits, vegetables, sugar, and butter was associated with a greater severity of IBS symptoms. Multivariate analysis identified several Mediterranean Diet foods to be associated with increased IBS symptoms.
A higher adherence to symptom-modified Mediterranean Diet was associated with a lower abundance of potentially harmful Faecalitalea, Streptococcus, and Intestinibacter, and higher abundance of potentially beneficial Holdemanella from the Firmicutes phylum.
A standard Mediterranean Diet was not associated with IBS symptom severity, although certain Mediterranean Diet foods were associated with increased IBS symptoms. Our study suggests that standard Mediterranean Diet may not be suitable for all patients with IBS and likely needs to be personalized in those with increased symptoms.❞
In graphical form:
And if you’d like to read more about this (along with more details on which specific foods to include or exclude to get these results), you can do so…
- The study itself (full article): The Association Between a Mediterranean Diet and Symptoms of Irritable Bowel Syndrome
- Dr. Mayer’s blog (lay explanation): The Benefits of a Modified Mediterranean Diet for Irritable Bowel Syndrome
Want to know more?
Dr. Mayer offers many resources, including a blog, books, recipes, podcasts, and even a YouTube channel:
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The Seven Sins Of Memory – by Dr. Daniel Schacter
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As we get older, we often become more forgetful—despite remembering many things clearly from decades past. Why?
Dr. Daniel Shacter takes us on a tour of the brain, and also through evolution, to show how memory is not just one thing, but many. And furthermore, it’s not just our vast memory that’s an evolutionary adaptation, but also, our capacity to forget.
He does also discusses disease that affect memory, including Alzheimer’s, and explores the biological aspects of memory too.
The “seven sins” of the title are seven ways our (undiseased, regular) memory “lets us down”, and why, and how that actually benefits us as individuals and as a species, and/but also how we can modify that if we so choose.
The book’s main strength is in how it separates—or bids us separate for ourselves—what is important to us and our lives and what is not. How and why memory and information processing are often at odds with each other (and what that means for us). And, on a practical note, how we can tip the scales for or against certain kinds of memory.
Bottom line: if you’d like to better understand human memory in all its glorious paradoxes, and put into place practical measures to make it work for you the way you want, this is a fine book for you.
Click here to check out The Seven Sins of Memory, and get managing yours!
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