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Questions tagged [sleep]

Sleep is a naturally recurring state characterized by reduced or absent consciousness, relatively suspended sensory activity, and inactivity of nearly all voluntary muscles. It is distinguished from quiet wakefulness by a decreased ability to react to stimuli, and is more easily reversible than being in hibernation or a coma.

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Is sleep “defragmentation” for your brain?

I've seem several articles claiming that sleep is akin to the usual proccess of hard drive defragmentation, however for your brain. This process allegedly prunes synapses/memories and reconsolidate ...
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441 views

Do water pillows improve sleep quality?

The manufacturer of a water-filled pillow claims: In a published study from The Johns Hopkins School of Medicine, The Water Pillow by Mediflow was clinically shown to improve quality of sleep and ...
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Does Earthing Therapy reduce cortisol secretion and help sleep?

Earthing Therapy involves "earthing" and "grounding" the human body by electrically connecting it to the ground. In the book Sleep Smarter, by Shawn Stevenson, he claims there is research that says ...
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“Relax and Win” - Classified military method to fall asleep quick?

The book Relax and Win by Bud Winter (a track coach) claims to reveal relaxation techniques developed by him and others for the US military: Based on mental and physical training methods used to ...
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299 views

Are people who sleep on the left side of the bed happier in their job?

According to a 2011 study by hotel chain Premier Inn, people who sleep on the left side are better off than those who sleep on the right side. One of the examples they give: In fact, 31% of ‘...
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Does your wifi router mess up your melatonin which messes up your sleep? [duplicate]

From https://www.kitguru.net/channel/generaltech/larry-alton/3-reasons-to-upgrade-your-network-with-cat6a-ethernet-cables/ If you’re one of thousands of people who suffer from EMF sensitivity, ...
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1answer
841 views

Does the “4-7-8” method help to fall asleep faster?

The "4-7-8" technique involves controlling your breath for a brief time to encourage falling to sleep faster. Each number consists of the period of seconds you spend during a certain part of ...
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Does orientation relative to the Earth's magnetic poles affect humans during sleep? [duplicate]

So generally in India they told you, you should not put your head to the north and sleep. [...] Suppose you are anemic and you go to your doctor what does your doctor prescribe for you? Iron. ...
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Is it healthy to sleep with the head under the blanket?

According to g9sleeptight.com (and many other websites), sleeping with the head under the blanket increases the risk of suffocation can trigger sleep apnea can cause brain damage stating "some ...
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1answer
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Does it take 30 seconds for a person to consciously realize that they're awake?

Source: "You actually have to be awake for a full 30 seconds to consciously realize that you are awake, but the body falls right back into sleep immediately after it wakes up to take a breath," ...
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440 views

Is there a risk to sleeping in a hammock long-term? [closed]

There seems to be very little research on long-term health or spine drawbacks to sleeping in a hammock (anything besides individuals informal blog-type posts). Just one study about sleeping in a ...
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3answers
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Do ultra-heavy blankets reduce stress and anxiety?

There's some buzz on news sites that seems to come from an article here: Scientists Assert That Ultra-Heavy Blankets Actually Reduce Stress and Anxiety which I think is connected to a Kickstarter ...
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Is the microorganism buildup in bedsheets harmful?

According to business insider, the New York University microbiologist Philip Tierno claims that bedsheets should be washed once a week and that mattresses should be changed more frequently because ...
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Is charging your phone overnight dangerous?

There are a number of news stories like this (in Russian) of an iPhone 5 burning up and causing a fire while charging overnight, seriously damaging the owner. There's another story going around of a ...
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1answer
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Do teenagers fall asleep and rise up later than kids or adults for biological reasons?

In a TED talk "Why school should start later for teens", Wendy Toxel made an assertion that teenagers naturally fall asleep and rise up a couple of hours later than children OR adults (related to ...
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358 views

Do we need less sleep when the Sun is shining at night?

I always bring black plastic sheets with me when going North in the Summer to make my bedroom pitch dark, but the local people seem to not be bothered by the Sun at night. However, they do say that ...
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Does Lee Hadwin have “artistic ability” only when asleep?

The artist Lee Hadwin claims that he paints only when he is asleep and has no artistic talent when he is awake. A dailymail article about his gallery opening: An artist who has no artistic ability ...
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1answer
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Can anyone function on just 2 hours sleep per night?

This infographic advert describes the sleeping habits of a few well-known people: A few of them were claimed to have gotten by with extremely little sleep. For example: Tesla, 2 hours of sleep per ...
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Has “the destruction of the space shuttle Challenger… been linked to insufficient sleep”?

According to Daylight Savings Time and Traffic Accidents N Engl J Med 1996; 334:924-925 Major disasters, including the nuclear accident at Chernobyl, the Exxon Valdez oil spill, and the destruction ...
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Does radiation from sleeping next to your smartphone affect your brain patterns negatively?

Vivian Giang writes in Sleep Drives Metabolite Clearance from the Adult Brain: In fact, as part of Swart’s Neuroscience For Leadership class at MIT in April, she discussed the serious health ...
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2answers
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Does Daylight Savings Time lead to an increase in car accidents and work related injuries the week afterwards?

In the segment Daylight Saving Time - How Is This Still A Thing? of John Oliver's Last Week Tonight it is said: Studies say that there's an increase in car accidents and work related injuries the ...
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Is it possible for a working person remain healthy just by 4 hours sleep a day? [closed]

Due to work pressure, I'm feeling that 24 hours is not enough to finish it in deadline. I've tried it for two days but felt impossible. I'd heard that successful person do not sleep long. I don't know ...
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Can audio played during REM sleep improve recall?

I was reading about sleep-learning - for example of the type depicted in The Simpsons episode, Bart's Friend Falls in Love: Homer orders a subliminal cassette tape to help him lose weight, but is ...
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0answers
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Does a boxspring offer advantages over slats? [closed]

Does a boxspring under a mattress offer advantages over flexible slats? I can imagine a boxspring might seem more luxurious since it feels more soft, but that doesn't mean that it supports your body ...
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0answers
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Does drinking water right after waking up reduce sleepiness?

Related but with no answers (at the time of this posting). Several websites and "health tips" blogs recommend doing this after waking up to reduce sleepiness after waking up. (references, google ...
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Will sleep deprivation kill you faster than starvation?

This article from Time Motto makes the claim that sleep deprivation will result in faster death than starvation. In the long run, work is not more important than sleep. If you aren’t sure how ...
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1answer
255 views

Can alcohol trigger insomnia?

Refer to the article How a glass of wine before bed wreaks havoc with your sleep: Alcohol disrupts body's internal timer and triggers insomnia: While glass of wine at night may help you drop off, ...
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1answer
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Do sleeping pills have a comparable mortality hazard ratio as cigarette smoking?

On Seth Robert's blog, Seth published an email discussing sleeping pills from Daniel Kripke saying: Imagine my surprise when I observed that sleeping pill use was associated with a comparable ...
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2answers
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Could this monk have lived nine days without food, water and sleep?

All over the news this week in Japan has been this story about a monk: A Buddhist monk on Wednesday finished a grueling nine-day ritual of not eating, drinking, or sleeping as he chanted sutras 100,...
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1answer
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Are there people who do not sleep at all?

There have been reports about people who didn't sleep at all for many years, see e.g. this newspaper article. The case of Paul Kern is the subject of this Wikipedia article, and this newspaper article....
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1answer
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Does sleeping on your left side improve digestion?

Does sleeping on the left side improve digestion? This article claims that it does, is there any truth to it? http://www.healthylifetricks.com/this-is-why-you-should-be-sleeping-on-your-left-side/ ...
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1answer
436 views

Does the hops in beer cause sleepiness?

Does the hops in beer have (a consistent and noticeable) effect on drowsiness? Whenever I drink a beer, I get so sleepy that I can barely keep my eyes open. Is it the hops? It can't be the just ...
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1answer
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Does eating dark chocolate eliminate night terrors?

In answer to a question on Parenting.SE about helping a child cope with night terrors, a user posted: Here's what you do For the little guy. For his night terrors give him 1 to 2 small square of ...
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Does sleeping in a cold room reduce the risk of diabetes?

According to Elite Daily, there may be some health benefits to sleeping in a room at between 60-67°F (15-19°C) In particular, they cite Temperature-acclimated brown adipose tissue modulates ...
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1answer
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Do women need more sleep than men?

The claim is that women need more sleep than men because they do more multi-tasking during the day. http://www.dailymail.co.uk/health/article-2528920/Women-DO-need-sleep-men-Multi-tasking-means-...
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0answers
441 views

Should you regularly replace your pillow?

According to an article in the Guardian: Out of 2,200 men and women, only 18% knew they should replace their pillows every two years. The average person uses the same pillow for three years and two ...
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How did people sleep in the past? [duplicate]

Recently I was told by a friend: People used to sleep in two shifts, one from 8pm to midnight, then wake up for an hour or two, before taking a second sleep shift from 2am to 6am. He claims that ...
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2answers
320 views

Do 7 to 12 year olds need 10 to 11 hours of sleep per day?

WebMD: 7-12 Years Old: 10 - 11 hours per day At these ages, with social, school, and family activities, bedtimes gradually become later and later, with most 12-years-olds going to bed at about 9 ...
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4answers
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While driving (or otherwise), do people experience microsleep and are unaware that it happened?

From Wikipedia (emphasis mine): When experiencing microsleeps while driving an automobile, from the perspective of the driver, he or she drives a car, and then suddenly realizes that several ...
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1answer
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Does white noise improve sleep quality?

I've heard it claimed that white noise improves sleep quality, and anecdotally I've found it to sometimes be true. There are many white noise devices targeted at improving sleep, but research on the ...
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Do salt lamps produce negative ions?

Do claims that Himalayan Salt Lamps produce negative ions when lit with an incandescent bulb have any science to back it up?
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1answer
1k views

Do expensive mattresses give better quality of sleep?

I'm currently shopping for a mattress, and prices range from $200-$2000+. My current mattress is a $500 IKEA memory foam mattress, and I feel like I get a good night's sleep, but if it could be shown ...
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0answers
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Can a raw-food diet allow someone to “switch” from one side of his brain to the other when he gets tired?

The following article relates this claim by someone who stayed awake for 11 days: How can someone stay awake for 11 days? He also employed a unique raw-food diet. Wright claims that his regimen ...
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2answers
3k views

Is it better to wake up in between sleep cycles than during one?

I saw this cute online sleep calculater. They claim (put in any time, and you'll see it): Sleep cycles typically last 90 minutes. Waking up in the middle of a sleep cycle leaves you feeling ...
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1answer
1k views

Does the average human take 14 minutes to fall asleep?

I saw this cute online sleep calculator. They claim (put in any time, and you'll see it): The average adult human takes fourteen minutes to fall asleep, so plan accordingly! Is this correct?
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0answers
168 views

Can I add around 10 years of wakeful time to my lifespan by practicing polyphasic sleep vs. an average Western lifespan? [duplicate]

I have read from various (low quality) sources that practicing polyphasic sleep would add around 10 years to my lifespan vs. an average Western lifespan. Polyphasic sleep refers to the practice of ...
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0answers
1k views

Was Leonardo da Vinci a polyphasic sleeper?

I have read from various (low quality) sources that Leonardo da Vinci practiced polyphasic sleep, maybe the Uberman's sleep schedule. Polyphasic sleep refers to the practice of sleeping multiple times ...
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1answer
556 views

Do humans sleep better in darkness?

Do humans (and I guess also most creatures) sleep better in darkness?
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2answers
866 views

Does reading off a self-luminous tablet impact the quality of sleep?

I've heard claimed many times that reading an iPad in bed makes for worse sleep quality than reading a book or a Kindle with a bedside lamp, Possible explanations I've heard are because of the ...
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0answers
150 views

Do intelligent people tend to stay up later? [duplicate]

I heard that people with high IQs stay up late. I found this article which in turn refers to this study: S. Kanazawa, K. Perina, Why night owls are more intelligent, Personality and Individual ...