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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6
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1answer
565 views

Do humans sleep better in darkness?

Do humans (and I guess also most creatures) sleep better in darkness?
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2answers
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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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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 ...
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1answer
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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 ...
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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 ...
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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 ...
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1answer
23k 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 ...
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1answer
671 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 ...
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1answer
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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 ...
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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 adjective ...
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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 ...
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1answer
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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 ...
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1answer
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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 their ...
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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 ...
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1answer
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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 ...
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1answer
618 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 ...
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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 ...
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1answer
953 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 ...
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1answer
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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, ...
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1answer
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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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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2answers
766 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 ...
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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 ...
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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 ...
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1answer
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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 ...
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1answer
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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 ...
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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,...
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1answer
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Does using the computer before sleeping affect sleep patterns?

According to this Bloomberg Businessweek article using electronics before bed may hamper sleep. Is it true that using a computer, watching T.V. or using some other type of face-to-screen electronics ...
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1answer
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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....
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1answer
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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 ...
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1answer
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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 ...
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1answer
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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....
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1answer
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Did Albert Einstein sleep 10-11 hours daily?

I heard many times that Albert Einstein needed a lot of sleep. For example, this BBC article claims that he typically needed eleven hours of sleep: People's sleep needs can differ significantly. ...
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2answers
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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 ...
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2answers
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Does learning immediately before going to sleep increase the effect?

I have read now several times as a "secret tip" that learning directly before going to sleep significantly increases the effectiveness of learning, probably the long-term memory when, for example, ...
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1answer
629 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 ...
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2answers
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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 ...
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1answer
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Is there a connection between sleep patterns and meat-eating?

There are a number of different and sometimes contradictory claims that changing your diet (especially with regard to avoid meat) can have an affect on your sleeping pattern. Here are a few related ...
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1answer
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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, ...
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1answer
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Can you tell if you're dreaming by pinching yourself?

Just yesterday I read how Tyrion tries to figure out if he's sleeping by pinching himself. And this seems to be a commonly held truth which often comes back in tales. But I'm not so certain. So can ...
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2answers
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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. ...
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2answers
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Do memory foam mattresses give off toxic fumes?

I recently purchased a memory foam (polyurethane) mattress and was looking online to see how long they take to "air out". They produce a strong odor for awhile after manufacture. However, instead of ...
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Is it better to sleep before midnight?

My father and I couldn't be more different when it comes to sleep. I rarely go to bed before midnight, while he will often retire around 9:30. While growing up, we'd often get into discussions on the ...
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1answer
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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 ...
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2answers
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Can devices detect your sleep cycle and wake you in a more refreshed state?

There are a number of products on the market that claim to be "better alarm clocks" that allows you to feel more refreshed when you wake - even if you sleep a few minutes or tens of minutes less. ...
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3answers
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Were our ancestors segmented sleepers?

Historian A. Roger Ekirch contends that in ancient times, people naturally had two sleeping periods at night- the first starts shortly after sundown and ends in an short break, where people were semi-...
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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, ...