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 ...

learn more… | top users | synonyms

0
votes
0answers
29 views

Is there a typical explanation for illusions of primitive geometric moving shapes when tired? [closed]

Once or twice when I was very tired trying to sleep but with my eyes open for some time in a static environment with nothing moving and not completely dark I saw the same optical illusion in the room ...
3
votes
0answers
144 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. ...
6
votes
0answers
222 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 ...
0
votes
0answers
48 views

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 ...
4
votes
2answers
204 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 ...
16
votes
4answers
889 views

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 ...
0
votes
0answers
139 views

Does 20 minutes of meditation equal 2 hours of sleep? [closed]

Many people claim that meditation can replace sleep. For example: Harbourside Fitness: 20 minutes of meditation is equal to 2 hours of sleep Is this true?
10
votes
1answer
348 views

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 ...
2
votes
0answers
112 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?
6
votes
1answer
383 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 ...
8
votes
0answers
141 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 ...
18
votes
2answers
881 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 ...
3
votes
1answer
295 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
0answers
115 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 ...
6
votes
0answers
554 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 ...
6
votes
1answer
421 views

Do humans sleep better in darkness?

Do humans (and I guess also most creatures) sleep better in darkness?
15
votes
1answer
412 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 ...
5
votes
0answers
113 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 ...
2
votes
0answers
83 views

While sleeping,one dont have the control over his body.how? [closed]

In nightmares,one knows that he's sleeping but he/she does not have the control over their body to wake up.Do you ever felt it?
8
votes
0answers
2k views

Does drinking warm milk help people fall asleep and if so what is it about it that does?

I always thought drinking warm milk before going to bed helps one fall asleep. According to Dr.Oz's friend, it does Dr. Oz talked with a sleep expert who said warm milk will help you fall ...
4
votes
0answers
309 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
395 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 ...
16
votes
1answer
11k views

Is sleeping on your left side bad for your heart?

I have been presented with the following conundrum. Either you sleep on your back and snore, or sleep on your right side and get acid reflux, or sleep on your left side and put a heavier load on your ...
4
votes
1answer
361 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 ...
8
votes
1answer
1k 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 ...
1
vote
2answers
321 views

Are any animals nocturnal? [closed]

Several animals are commonly considered to be 'nocturnal' by nature. Nocturnality is an animal behavior characterized by activity during the night and sleeping during the day. The common ...
11
votes
0answers
718 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 ...
0
votes
1answer
423 views

Does excessive menthol cause sleepiness?

Does over consumption of menthol cause sleepiness? I found no substantial sources either to suport or refute this argument. I have heard it from a few sources not perfectly reliable. I do know that ...
22
votes
1answer
718 views

Do adults sleep better when they sleep alone?

Newyorker: Research studies consistently find … that adults “sleep better when given their own bed.” Is that an accurate assessment? Do adult sleep better when they sleep alone rather than with ...
3
votes
0answers
159 views

Can irregular sleeping hours cause developmental issues for the brain?

It seems to be a common belief (i.e. here) that in order for our brain to rest and grow properly, we need to have regular, maintained sleeping regimes. While there seems to be no doubt that sleeping ...
17
votes
1answer
5k views

Are intelligent people more nocturnal than people not considered intelligent?

Some sites claim that people with higher intelligence tend to go to bed later. For example: People with higher IQs are more apt to be nocturnal night-owls. Those with lower IQs tend to restrict ...
1
vote
1answer
460 views

Why does small amount of night time sleep makes a person more tired when he wakes up? [closed]

Assume that you go to sleep at 0:00 am and wake up at 3:00 am. Why do you feel more tired (compared to your tiredness at 23:59) when you wake up at 3:00 am? Why does sleep makes us more tired in this ...
14
votes
1answer
1k views

Do memory foam mattresses help reduce back pain?

Memory foam and related products have claims like TEMPUR Mattresses create a custom fit for your body, virtually eliminating painful pressure points and reducing your body’s need to toss and turn ...
7
votes
0answers
418 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 ...
7
votes
1answer
5k 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 ...
3
votes
1answer
4k 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. ...
10
votes
0answers
2k views

Does taking cold baths before sleeping help you sleep better?

Recently I heard in some gyms with saunas that if you go to the sauna and then hop in a cold shower you can have a great night of sleep after. I saw it in the Four Hour Work Weekblog: Japanese ...
16
votes
2answers
1k views

Is “co-sleeping” (infant sleeps in bed with parents) safe?

Among some circles, co-sleeping is highly advocated for newborns/infants due to ease of breastfeeding and potential developmental bonding to the mother (for more examples, read about proposed ...
11
votes
0answers
518 views

Which position is healthiest for sleep?

If you believe the internet, there is no healthy way for you to sleep: front, back, side, fetal; they are all going to cause you problems like acid reflux, spinal problems, skin problems, problems ...
3
votes
1answer
871 views

Is the best way to fall asleep by trying to stay awake? [closed]

In the movie Saving Private Ryan, the soldiers are discussing how difficult it is to fall asleep, when one of them suggests that the best way to fall asleep is to try to keep yourself awake. He then ...
50
votes
3answers
6k views

Do we need 8 hours of consecutive sleep a day?

It is said that an adult human needs around 7-9 hours of sleep per day. Do human beings need around 8 hours of consecutive sleep a day? Is it prejudicial to the body and brain that you don't? Or is ...
10
votes
0answers
396 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
2answers
649 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
votes
0answers
457 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 ...
9
votes
0answers
750 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 ...
23
votes
1answer
6k views

Do side sleeping postures contribute to breast sagging?

CNN claims that sleeping on your side and sleeping on your stomach can lead to saggy breasts. Sleeping on your side can cause you to get wrinkles," Glaser says. Blame all that smushing of one side ...
9
votes
1answer
774 views

Is it possible to drive while sleepwalking?

I recently watched a movie called In My Sleep where the character allegedly is able to drive and even have sex while he is "sleepwalking." Marcus struggles with parasomnia, a sleepwalking disorder ...
8
votes
0answers
3k 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 ...
4
votes
0answers
285 views

Do heavy meals within two hours of sleeping interfere with rest?

The claim is that if you eat a "heavy" (i.e. animal fats and processed foods) shortly before going to sleep, then your sleep will be less restful and you wake up groggy. Example of the claim: If ...
2
votes
0answers
593 views

Is there evidence that you feel more tired two days after getting little sleep? [closed]

I've experienced this at times personally but not consistently, though I'm sure it depends on how much sleep is gotten the second night. Others have also shared anecdotes that there is indeed a one ...