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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Why Your Brain Blinds You For 2 Hours Every Day
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…and then covers its tracks so that you don’t notice:
Now you see it…
The world you experience is not an accurate representation of reality. Your brain actively constructs your perception, editing your memories as they happen and manipulating your sense of time. What you perceive as the present moment is actually a processed and reconstructed version of past events.
Nor is your vision anywhere near as detailed as it seems. Only a small central portion is in high resolution, while the rest is blurry. Your brain compensates for this by filling in the gaps with its best guess and/or what it believes is there from the last time you saw it. Your eyes constantly make rapid movements called saccades, and during these (i.e. when your eyes are moving), your vision momentarily shuts down—making you effectively blind for (in total, if we add them all up) about two hours every day (according to this video, anyway; our calculations find it to be more than that, but you get the idea). Your brain stitches together the visual input, creating a seamless experience that feels continuous (much like an animation reel composed of still images).
Why does it do this?
It’s because your senses operate at different speeds—light reaches your eyes in nanoseconds, sound in milliseconds, and touch signals in tens of milliseconds. However, your brain processes these inputs together, creating the illusion of a smooth and simultaneous experience. In reality, what you perceive as the present is actually a delayed and selectively edited version of the past.
Instead of showing you the world as it is, your brain predicts what will happen next. In high-speed situations, such as playing table tennis, if your brain relied on past sensory data, you wouldn’t react in time. Instead, it estimates an object’s future position and presents that prediction as your visual reality.
This also means that because your brain effectively sees things slightly sooner than you do, your brain has already prepared multiple possible responses and when an event occurs, it quickly selects the most likely course of action, deleting the alternatives before you are even aware of them. By the time you think you’ve made a decision, your body has already acted.
This goes for more than just the things we think of as requiring quick reactions!
Walking is a complex task that involves multiple time layers—your brain processes past feedback, assesses your current state, and predicts future movements. That’s why it was something that cyberneticists found difficult to recreate for a very long time. If something unexpected happens, like slipping cartoon-style on a banana peel, your body reacts before you consciously notice the danger. Your spinal cord and brainstem trigger emergency reflexes to stabilize you before your conscious mind even catches up.
For more on all of this, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like:
This Main Feature Should Take You Two Minutes (and 18 Seconds) To Read ← There’s a problem nobody wants to talk about when it comes to speed-reading; can you guess what it is based on what we just talked about above?
Take care!
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Hormone Replacement
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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
❝I cant believe 10 Almonds addresses questions. Thanks. I see the word symptoms for menopause. I don’t know what word should replace it but maybe one should be used or is symptom accurate? And I recently read that there was a great disservice for women in my era as they were denied/scared of hormones replacement. Unnecessarily❞
You’d better believe it! In fact we love questions; they give us things to research and write about.
“Symptom” is indeed an entirely justified word to use, being:
- General: any phenomenon or circumstance accompanying something and serving as evidence of it.
- Medical: any phenomenon that arises from and accompanies a particular disease or disorder and serves as an indication of it.
If the question is more whether the menopause can be considered a disease/disorder, well, it’s a naturally occurring and ultimately inevitable change, yes, but then, so is cancer (it’s in the simple mathematics of DNA replication and mutation that, unless a cure for cancer is found, we will always eventually get cancer, if nothing else kills us first).
So, something being natural/inevitable isn’t a reason to not consider it a disease/disorder, nor a reason to not treat it as appropriate if it is causing us harm/discomfort that can be safely alleviated.
Moreover, and semantics aside, it is medical convention to consider menopause to be a medical condition, that has symptoms. Indeed, for example, the US’s NIH (and its constituent NIA, the National Institute of Aging) and the UK’s NHS, both list the menopause’s symptoms, using that word:
- NIA (NIH): What are the signs and symptoms of menopause?
- NHS: Common symptoms of menopause and perimenopause
With regard to fearmongering around HRT, certainly that has been rife, and there were some very flawed (and later soundly refuted) studies a while back that prompted this—and even those flawed studies were not about the same (bioidentical) hormones available today, in any case. So even if they had been correct (they weren’t), it still wouldn’t be a reason to not get treatment nowadays, if appropriate!
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Why Psyllium Is Healthy Through-And-Through
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Psyllium is the powder of the husk of the seed of the plant Plantago ovata.
It can be taken as a supplement, and/or used in cooking.
What’s special about it?
It is fibrous, and the fiber is largely soluble fiber. It’s a “bulk-forming laxative”, which means that (dosed correctly) it is good against both constipation (because it’s a laxative) and diarrhea (because it’s bulk-forming).
See also, because this is Research Review Monday and we provide papers for everything:
In other words, it will tend things towards being a 3 or 4 on the Bristol Stool Scale ← this is not pretty, but it is informative.
Before the bowels
Because of how it increases the viscosity of substances it finds itself in, psyllium slows stomach-emptying, and thus improves feelings of satiety.
Here’s a study in which taking psyllium before breakfast and lunch resulted in increased satiety between meals, and reduction in food-related cravings:
Satiety effects of psyllium in healthy volunteers
Prebiotic benefits
We can’t digest psyllium, but our gut bacteria can—somewhat! Because they can only digest some of the psyllium fibers, that means the rest will have the stool-softening effect, while we also get the usual in-gut benefits from prebiotic fiber first too:
The Effect of Psyllium Husk on Intestinal Microbiota in Constipated Patients and Healthy Controls
Cholesterol-binding
Psyllium can bind to cholesterol during the digestive process. Why only “can”? Well, if you don’t consume cholesterol (for example, if you are vegan), then there won’t be cholesterol in the digestive tract to bind to (yes, we do need some cholesterol to live, but like most animals, we can synthesize it ourselves).
What this cholesterol-binding action means is that the dietary cholesterol thus bound cannot enter the bloodstream, and is simply excreted instead:
Heart health beyond cholesterol
Psyllium supplementation can also help lower high blood pressure but does not significantly lower already-healthy blood pressure, so it can be particularly good for keeping things in safe ranges:
❝Given the overarching benefits and lack of reported side effects, particularly for hypertensive patients, health care providers and clinicians should consider the use of psyllium supplementation for the treatment or abatement of hypertension, or hypertensive symptoms.❞
Read in full: The effect of psyllium supplementation on blood pressure: a systematic review and meta-analysis of randomized controlled trials ← you can see the concrete numbers here
Is it safe?
Psyllium is first and foremost a foodstuff, and is considered very safe unless you have an allergy (which is rare, but possible).
However, it is still recommended to start at a low dose and work up, because anything that changes your gut microbiota, even if it changes it for the better, will be easiest if done slowly (or else, you will hear about it from your gut).
Want to try some?
We don’t sell it, but here for your convenience is an example product on Amazon
Enjoy!
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An unbroken night’s sleep is a myth. Here’s what good sleep looks like
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What do you imagine a good night’s sleep to be?
Often when people come into our sleep clinic seeking treatment, they share ideas about healthy sleep.
Many think when their head hits the pillow, they should fall into a deep and restorative sleep, and emerge after about eight hours feeling refreshed. They’re in good company – many Australians hold the same belief.
In reality, healthy sleep is cyclic across the night, as you move in and out of the different stages of sleep, often waking up several times. Some people remember one or more of these awakenings, others do not. Let’s consider what a healthy night’s sleep looks like.
Bricolage/Shutterstock Sleep cycles are a roller-coaster
As an adult, our sleep moves through different cycles and brief awakenings during the night. Sleep cycles last roughly 90 minutes each.
We typically start the night with lighter sleep, before moving into deeper sleep stages, and rising again into rapid eye movement (REM) sleep – the stage of sleep often linked to vivid dreaming.
If sleeping well, we get most of our deep sleep in the first half of the night, with REM sleep more common in the second half of the night.
Deepest sleep usually happens during the first half of the night. Verin/Shutterstock Adults usually move through five or six sleep cycles in a night, and it is entirely normal to wake up briefly at the end of each one. That means we might be waking up five times during the night. This can increase with older age and still be healthy. If you’re not remembering these awakenings that’s OK – they can be quite brief.
What does getting a ‘good’ sleep actually mean?
You’ll often hear that adults need between seven and nine hours of sleep per night. But good sleep is about more than the number of hours – it’s also about the quality.
For most people, sleeping well means being able to fall asleep soon after getting into bed (within around 30 minutes), sleeping without waking up for long periods, and waking feeling rested and ready for the day.
You shouldn’t be feeling excessively sleepy during the day, especially if you’re regularly getting at least seven hours of refreshing sleep a night (this is a rough rule of thumb).
But are you noticing you’re feeling physically tired, needing to nap regularly and still not feeling refreshed? It may be worthwhile touching base with your general practitioner, as there a range of possible reasons.
Common issues
Sleep disorders are common. Up to 25% of adults have insomnia, a sleep disorder where it may be hard to fall or stay asleep, or you may wake earlier in the morning than you’d like.
Rates of common sleep disorders such as insomnia and sleep apnoea – where your breathing can partially or completely stop many times during the night – also increase with age, affecting 20% of early adults and 40% of people in middle age. There are effective treatments, so asking for help is important.
Beyond sleep disorders, our sleep can also be disrupted by chronic health conditions – such as pain – and by certain medications.
There can also be other reasons we’re not sleeping well. Some of us are woken by children, pets or traffic noise during the night. These “forced awakenings” mean we may find it harder to get up in the morning, take longer to leave bed and feel less satisfied with our sleep. For some people, night awakenings may have no clear cause.
A good way to tell if these awakenings are a problem for you is by thinking about how they affect you. When they cause feelings of frustration or worry, or are impacting how we feel and function during the day, it might be a sign to seek some help.
If waking up in the night is interfering with your normal day-to-day activities, it may indicate a problem. BearFotos/Shutterstock We also may struggle to get up in the morning. This could be for a range of reasons, including not sleeping long enough, going to bed or waking up at irregular times – or even your own internal clock, which can influence the time your body prefers to sleep.
If you’re regularly struggling to get up for work or family needs, it can be an indication you may need to seek help. Some of these factors can be explored with a sleep psychologist if they are causing concern.
Can my smart watch help?
It is important to remember sleep-tracking devices can vary in accuracy for looking at the different sleep stages. While they can give a rough estimate, they are not a perfect measure.
In-laboratory polysomnography, or PSG, is the best standard measure to examine your sleep stages. A PSG examines breathing, oxygen saturation, brain waves and heart rate during sleep.
Rather than closely examining nightly data (including sleep stages) from a sleep tracker, it may be more helpful to look at the patterns of your sleep (bed and wake times) over time.
Understanding your sleep patterns may help identify and adjust behaviours that negatively impact your sleep, such as your bedtime routine and sleeping environment.
And if you find viewing your sleep data is making you feel worried about your sleep, this may not be useful for you. Most importantly, if you are concerned it is important to discuss it with your GP who can refer you to the appropriate specialist sleep health provider.
Amy Reynolds, Associate Professor in Clinical Sleep Health, Flinders University; Claire Dunbar, Research Associate, Sleep Health, Flinders University; Gorica Micic, Postdoctoral Research Fellow, Clinical Psychologist, Flinders University; Hannah Scott, Research Fellow in Sleep Health, Flinders University, and Nicole Lovato, Associate Professor, Adelaide Institute for Sleep Health, Flinders University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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The Diet Myth – by Dr. Tim Spector
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Why are we supposed to go low-carb, but get plenty of whole grains? Avoid saturated fat, but olive oil is one of the healthiest fats around? Will cheese kill us or save us? Even amongst the well-informed, there’s a lot of confusion. This book addresses these and many such topics.
A main theme of the book is howa lot of it relates to the state of our gut microbiome, and what is good or bad for that. He also discusses, for example, how microbes predict obesity better than genes, and the good news is: we can change our microbes a lot more easily than we can change our genes!
In the category of criticism, he repeats some decades-old bad science in some areas outside of his field (i.e. unrelated to nutrition), so that’s unfortunate, and/but doesn’t detract from the value of the book if we keep to the main topic.
Bottom line: if you’d like to understand better the physiology and microbiology behind why dieting does work for most people (and how to do it better), then this is a great book for that.
Click here to check out The Diet Myth, and learn the science behind the confusion!
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Understanding Cellulitis: Skin And Soft Tissue Infections
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What’s the difference between a minor passing skin complaint, and a skin condition that’s indicative of something more serious? Dr. Thomas Watchman explains:
More than skin-deep
Cellulitis sounds benign enough, like having a little cellulite perhaps, but in fact it means an infection of the skin and—critically—the underlying soft tissues.
Normally, the skin acts as a barrier against infections, but this barrier can be breached by physical trauma (i.e. an injury that broke the skin), eczema, fungal nail infections, skin ulcers, and other similar things that disrupt the skin’s ability to protect us.
Things to watch out for: Dr. Watchman advises we keep an eye out for warm, reddened skin, swelling, and blisters. Specifically, a golden-yellow crust to these likely indicates a Staphylococcus aureus infection (hence the name).
There’s a scale of degrees of severity:
- Class 1: No systemic toxicity or comorbidities
- Class 2: Systemic toxicity or comorbidities present
- Class 3: Significant systemic toxicity or comorbidities with risk of significant deterioration
- Class 4: Sepsis or life-threatening infection
…with antibiotics being recommended in the latter two cases there, or in other cases for frail, young, old, or immunocompromised patients. Given the rather “scorched earth” results of antibiotics (they cause a lot of collateral iatrogenic damage), this can be taken as a sign of how seriously such infections should be taken.
For more about all this, including visual guides, enjoy:
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Want to learn more?
You might also like to read:
- Of Brains & Breakouts: The Brain-Skin Doctor
- Beyond Supplements: The Real Immune-Boosters!
- Antibiotics? You Might Want To Think Thrice
Take care!
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