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.

14
votes
0answers
1k views

Is sleepiness after a goods night's sleep a sign of dehydration?

If you still feel tired after a good night's sleep, you're probably dehydrated. Drink some water after you wake up. — Just So You Know (@Know) April 22, 2013 Some quick searching unsurprisingly ...
13
votes
1answer
3k views

Does sleeping an average of 11 hours or more raise one's risk of brain-related disorders?

I am familiar with the effects of sleep deprivation and some of the harmful effects of oversleeping. However, I have also heard more than once that sleeping more than 10 hours on average, even for a ...
13
votes
1answer
1k views

Is it dangerous to wake a sleepwalker?

Source It seems to be a common belief that you should never wake up a sleepwalker From Wikipedia - Sleepwalking: There are conflicting viewpoints on whether it is harmful to wake a sleepwalker....
12
votes
1answer
13k views

Do bullfrogs sleep?

Today I came across this picture: So I searched a bit about it. In this wiki answer it is stated that: Bullfrogs do sleep. They sleep underground from 2- 4 weeks. Sounded ok, but in this website, ...
12
votes
2answers
2k views

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,...
12
votes
3answers
2k views

Do “blue light therapy” systems help with sleeping disorders?

I've seen blue light therapy systems which just look like a bunch of LED blue lights being sold online and in stores. They claim to help with sleeping disorders and jet lag. How are they supposed to ...
12
votes
1answer
945 views

Is there any correlation between sleeping position and personality?

I've read in various news sites (1, 2, 3) that sleeping position correlates with personality. Most go as far as describing what personality traits are linked to each different position but no mentions ...
12
votes
2answers
761 views

Can Software Help You Sleep?

I've come across software that claims to improve one's sleep and to help falling asleep in the first place, by listening to an audio track with spoken words, music, and ambient sounds. Here's one ...
12
votes
1answer
2k views

Does sleeping on your left side, while pregnant, improve blood flow?

According to babycenter.com and countless other pregnancy sites and youtube videos, women should sleep on their left side while pregnant to improve blood flow to the fetus: Sleeping on your side is ...
12
votes
0answers
259 views

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 ...
11
votes
1answer
6k views

Do sharks never sleep?

My friend was saying that shark never sleeps. Because to keep it afloat, it has to continuously swim, so that it can't sleep. This claim is repeated in the Ocean of Know: They certainly need to ...
11
votes
2answers
5k views

Is shared dreaming possible?

Mutual dreaming or shared dreaming is the claim that two or more people can share the same dream environment. I have experienced a numerous lucid dreams but I've never met a known person in such ...
11
votes
1answer
830 views

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 ...
11
votes
1answer
632 views

Are organic mattresses healthier than the alternatives?

Some stores sell "organic mattresses" or "non-chemical" mattresses (consisting of 'all-natural' latex, as if latex were not a chemical) for children. Example Example Some of them make health claims, ...
11
votes
0answers
2k views

“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 ...
11
votes
0answers
318 views

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 ...
10
votes
2answers
5k views

Does putting a bar of soap under your mattress prevent leg cramps?

I've heard this claim several times from family members, and I was highly skeptical. Supposedly the mere presence of a bar of soap underneath the mattress can ward off leg cramps during the night. ...
10
votes
2answers
3k views

Can a hypnosis audiobook induce epileptic seizures?

I noticed a warning on a hypnosis/self-help audiobook that read as follows: Warning: This audiobook contains powerful techniques. Do not listen if you suffer from epilepsy. My inclination is ...
10
votes
0answers
519 views

Does oversleeping lead to reduced alertness?

There are several studies (Example 1, Example 2) about the effect of sleep deprivation on alertness and cognitive performance. Are there any studies investigating the opposite - The effect of too ...
10
votes
0answers
833 views

Has hypnopaedia been proven to work? To what extent?

The idea of learning during sleep, say by listening to a recorded class, can be tempting to make a good use of roughly a third of the day. Has it ever worked though? If so what is the most efficient ...
10
votes
0answers
9k views

Can you snore and dream at the same time?

According to numerous sources on the internet, you cannot snore and dream at the same time. Source 1 If you are snoring, then you cannot be dreaming. This fact is repeated all over the Internet,...
9
votes
1answer
2k views

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 ...
9
votes
0answers
373 views

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?
9
votes
0answers
184 views

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 ...
9
votes
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 ...
8
votes
1answer
627 views

Do lone sailors alternate between short period of sleep and awareness?

An unsourced claim on Wikipedia is that single-handed sailors only sleep one hour at a time: Most single-handers use the technique of napping for 15 to 20 minutes at a time, using a timer to wake ...
8
votes
1answer
2k views

Does “not drinking water” help you sleep better?

Recently I had been seeing some websites that suggest not to drink anything before going to bed. One of the reasons is to prevent waking up feeling want to pee. And it disturbs your sleep. But I feel ...
8
votes
1answer
2k views

Can mobile apps monitor your sleep cycles?

There's already been a question about devices that can help you monitor your sleep and their possible benefits, but I'm interested specifically in the apps for mobile devices that claim to be able to ...
7
votes
3answers
1k views

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 ...
7
votes
1answer
607 views

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 ...
7
votes
0answers
152 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 ...
6
votes
1answer
363 views

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 ...
6
votes
1answer
759 views

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," ...
6
votes
1answer
562 views

Do humans sleep better in darkness?

Do humans (and I guess also most creatures) sleep better in darkness?
6
votes
1answer
6k views

Do koalas sleep 22 hours a day?

I came across this image on Facebook from the website Learn Something Every Day: When I searched for a reliable source, I came across several sites of the same kind (OMG Facts, Snapple Real Facts,etc....
6
votes
1answer
851 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 ...
6
votes
1answer
2k views

Playing music at night for babies/toddlers causes or contributes to ADD/ADHD

I've heard that playing music at night for babies and toddlers (i.e. children under 2 years old) can cause or contribute to Attention Deficit Disorder (ADD/ADHD) when they get older. Is there any ...
5
votes
2answers
401 views

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 ...
5
votes
2answers
327 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 ...
5
votes
1answer
1k views

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 ...
5
votes
1answer
1k views

Do memory foam mattresses cause inflammation?

According to a competitor, [...] the visco memory foam mattress cuts off circulation and increases inflammation. This is in keeping with my personal experience of inflammation. Is that just an ...
5
votes
0answers
304 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 ‘...
5
votes
0answers
340 views

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 ...
5
votes
0answers
547 views

Does eating cheese help one to fall asleep or have a sound sleep?

Does eating cheese help one to fall asleep or have a sound sleep? According to Dr. Oz it does: Cheese and 100% whole grain crackers are your best bedtime-snack bet. The whole grains help produce ...
4
votes
1answer
662 views

Does the phase of the Moon affect human sleep patterns?

From The Economist - "Lunacy? People do not sleep easy on nights when there is a full Moon": And the answer was “yes”, the phase of the Moon does affect human sleep patterns, even when the human ...
4
votes
1answer
1k views

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-...
3
votes
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?
3
votes
1answer
444 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 ...
3
votes
1answer
9k views

Is sleeping on airbeds unhealthy?

I have often heard from people that sleeping on airbeds is not good for health, reasoning that it is filled with air and molds to the shape of our body, so cannot provide enough support for the back. ...
3
votes
0answers
466 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 ...