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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12
votes
2answers
765 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 ...
10
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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
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0answers
835 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
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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. ...
25
votes
1answer
47k views

Is there a risk of drowning if you fall asleep in the bath?

Are there any documented events of people drowning in slippery baths after falling asleep? I've tried to Google it but wasn't able to find anything. Probably just used wrong terms, or maybe there ...
13
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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....
15
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1answer
2k views

Has lucid dreaming been scientifically observed?

I found this anecdote in Surely You're Joking, Mr. Feynman! by Richard Feynman. In the passage below, Feynman describes his attempts to analyze his dreams I also noticed that as you go to sleep the ...
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....
21
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2answers
1k views

Are there people who can naturally and sustainably function with much less sleep than average?

Over the years I've heard many claims of the ability to have very little sleep every day, sometimes including weekends and vacation, and be highly functional at work. Most recently these claims showed ...
8
votes
1answer
628 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 ...
24
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1answer
7k views

Do mattresses double their weight after 10 years?

I've heard this story for years: After you bring a mattress home, dust mites move in (possibly even before). Like all creatures, they create waste products, which allegedly accumulate over time. The ...
20
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3answers
4k views

Does caffeine later in the day affect quality of sleep?

My wife is often telling me that drinking coffee later in the day will lower my "quality of sleep." Is this so? For an example of a bit beefier of a source for this claim, consider THIS blog post, ...
8
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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 ...
13
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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 ...
16
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1answer
838 views

Are we supposed to keep a 24 hour rest/wake cycle?

I find it nearly impossible to keep a 24 hour day cycle and the developed world have been structured into the 8 hour work day where you have: Eight hours labour, Eight hours recreation, Eight ...
6
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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 ...
24
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1answer
9k views

How effective is melatonin for aiding with sleep difficulty?

From Wikipedia: Taken 30 to 90 minutes before bedtime, melatonin supplementation acts as a mild hypnotic. It causes melatonin levels in the blood to rise earlier than the brain's own production ...
19
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2answers
2k views

Learning while you are sleeping

Just to clarify, I'm not asking about Hypnopaedia, but about using a lucid dream as a training/rehearsal stage. The Lucidity Institue claims: ... many people use lucid dreaming to rehearse for ...