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Questions tagged [sleep]

For questions pertaining to the physiology and pathophysiology of sleep in humans and animals (e.g., sleep stages and their EEG patterns, sleep disturbances), along with psychological effects of sleep deprivation or fatigue.

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29 votes
2 answers
3k views

Can you catch up on sleep over the weekend?

The lack of sleep has many negative effects associated with it. Maintained sleep deprivation results in a degraded performance over time (in this case reaction time). Assuming one needs 8 hours of ...
Steven Jeuris's user avatar
  • 3,523
24 votes
2 answers
11k views

How long do dreams last?

What is the relationship between time perceived in a dream and time in the external world? Is time running in dreams always faster than the time running in the real world? Is it ratio of real time ...
Deep-est Shah's user avatar
15 votes
1 answer
24k views

What is the scientific term for unexpected, spontaneous dream recall?

I'm interested if there's a term for spontaneous dream recall. I will try to define the phenomenon I'm talking about. Over 10 years ago, I started to notice that I can spontaneously recall dreams, ...
Alex Stone's user avatar
  • 9,390
11 votes
2 answers
1k views

How are people able to wake themselves up after a pre-specified amount of time?

Auto-suggestion seems to work. Several people I know seem to be able to tell themselves "I'll wake up after 'N' hours/minutes", and do so within a minute or two of that duration. I thought for a ...
Everyone's user avatar
  • 419
7 votes
0 answers
655 views

How much sleep is required to restore maximum cognitive functioning? [closed]

Background: Recently I have really messed up my sleep schedule due to my procrastination. The internet points to some very basic conclusions but I would like to see actual experiments on effects of ...
Aman's user avatar
  • 179
7 votes
1 answer
235 views

Can one incubate on a specific idea in one's sleep?

In this question it is described that intentionally not thinking about a problem can allow the subsonscious to find an answer to the problem; this is known as incubation. I have heard and read it a ...
Anubhav's user avatar
  • 179
5 votes
1 answer
633 views

How much sleep is needed for peak cognitive performance?

How much sleep is needed for peak cognitive performance? If some were to, for example, wake up one morning at 12:30PM, would a sleeping pill help obtain better sleep required for that performance the ...
Bozo Vulicevic's user avatar
23 votes
1 answer
930 views

Medium-term effects of polyphasic sleep on performance

Typical sleep patterns of one big block of 6 to 9 hours with no naps is usually referred to as monophasic sleep. A second natural sleep pattern is biphasic sleep which breaks up your sleep into two ...
Artem Kaznatcheev's user avatar
20 votes
1 answer
578 views

Does dream recall disturb the processes of memory consolidation?

Psychology in the time of Freud was occupied with dreams. Relaying these to one's analyst was an important part of treatment. Fast-forward to less than 100 years later, and we know so much about the ...
Chuck Sherrington's user avatar
19 votes
1 answer
608 views

Does dream recall interfere with "reverse learning"? (Crick and Mitchison's theory of REM sleep)

I've recently became aware of the idea of "reverse learning" that might happen during REM sleep - the brain's attempt to eliminate pathological attractors that might appear in neural networks. The ...
Alex Stone's user avatar
  • 9,390
18 votes
1 answer
3k views

Do people wake up faster with inconsistent alarm sounds?

Many people have one alarm clock sound that wakes them up every morning. Is having this consistent sound the optimal way to wake someone up? Or can you startle someone faster by changing to a ...
JoJo's user avatar
  • 675
15 votes
2 answers
47k views

How is fasting related to insomnia?

Yesterday I started a new diet using intermittent fasting. For this reason I only ate one meal all day. I was pretty surprised how well I passed that day: I studied a lot, did some sports and ...
Jon's user avatar
  • 253
15 votes
3 answers
51k views

Can sleep become addictive?

Can a person become dependent on sleeping (more than they otherwise physically need) in a way that fits the definition of addiction, in the same way some psychology professionals may describe a person ...
Nicole's user avatar
  • 259
14 votes
2 answers
476 views

What factors improve mood and increase cognitive functioning when people wake up?

I'm a software engineer doing some research in order to figure out if developing some applications are worth the effort. This work is applied to computational devices including mobile devices and even ...
bmartins's user avatar
  • 243
12 votes
1 answer
111k views

Why do we wake up when we die in our dreams?

A lot of people had some experience with dying in their dreams. They all confirm they remember the whole story until the precise moment of death and it is the death itself what woke them up - not ...
vojta's user avatar
  • 223
12 votes
1 answer
254 views

What defines the easiest time to get out of bed in the morning for humans?

I'm interested in sleep research, and sometimes in conversations with people the following idea gets discussed: "A person becomes aware at a certain time in the morning and feel great(while still in ...
Alex Stone's user avatar
  • 9,390
9 votes
1 answer
222 views

Can adults adapt to less sleep?

I am asking whether adults, especially in circumstances like a monastery or Zen center, can become able long-term to sleep only about 4 to 5 hours a night? So, that would mean: no children to care for,...
user avatar
9 votes
1 answer
499 views

Can time be slowed in a lucid dream?

Lucid dreams allow a person to be conscious while dreaming. It has been reported that it's possible to control various aspects of the dream environment that are not possible during wakefulness, e.g. ...
Justas's user avatar
  • 1,537
8 votes
1 answer
45k views

If you sleep during the day, do you need less sleep at night?

If, say, you sleep 2-3 hours during the day (in the afternoon) - Do you need less sleep at night? After all, subjects feel less tired in the evening after sleeping during day. Can sleep hours be ...
user avatar
8 votes
1 answer
307 views

Sleep deprivation and task performance

Case: In case of an adult, the average adult sleep time required is 7.5 to 8 hours. Suppose the person (aged between 23-29) has slept only 6 hours, or less than the average time (7.5 to 8 hours). ...
New one's user avatar
  • 333
8 votes
1 answer
165 views

How much additional sleep is required to recover from a given number of hours of sleep deprivation? [duplicate]

A previous question dealt with whether it is possible to catch up on lost sleep. This question is a little different. Assume that a healthy adult has been deprived of sleep for "x" hours. How much ...
user avatar
7 votes
2 answers
181 views

Is there any scientific data showing one can learn while sleeping?

Time is short in the days of learning for me but I like listening to lectures and case studies about code in my field. I've thought about getting a Bluetooth Sleep Headphone to possibly listen to ...
Gʀɪᴍ's user avatar
  • 171
7 votes
2 answers
245 views

What factors determine a healthy individual's required amount of sleep?

I suppose that it is well-known that different people need different amounts of sleep. I read somewhere that most people need something between 7 and 8 hours each day, though some people need only 6 ...
J. Doe's user avatar
  • 71
7 votes
1 answer
199 views

Is mindfulness meditation an effective method to fall asleep?

It's my understanding that brain activity in the prefrontal cortex is suppressed during sleep and that mindfulness stimulates activity in that region. Based on this, it seems counterintuitive to think ...
Wuschelbeutel Kartoffelhuhn's user avatar
7 votes
1 answer
1k views

What is the difference between drug withdrawal and sleep deprivation effects?

Personal sleep-deprivation study: Recently, I posed a question that I'm sure many people find tough already: "Do I really need to sleep?", and so I tested myself, I spent two days without sleeping. ...
Enoque Duarte's user avatar
7 votes
2 answers
1k views

Is there a scientific term for when you fall asleep because you can't handle something?

I'm wondering if there is a scientific term that describes when you fall asleep or pass out after some traumatic event? This effect happens when people witness something gruesome (a friend being ...
user avatar
5 votes
1 answer
205 views

Does night-sleep-deprivation have any effect on cognitive performance?

Sleeping during the day might lead e.g. to vitamin D deficiency. But I am interested in what effects might night-sleep-deprivation have on cognitive faculties. Does sleeping during the day and ...
Cauchy's user avatar
  • 151
5 votes
0 answers
34 views

How to compare cumulative sleep debts? [duplicate]

Let's say that after a period of sleeping perfectly, I sleep for the following amount of hours on some consecutive days. (Let's say the optimal hours I sleep is 8 hours. For the sake of simplicity, ...
mic's user avatar
  • 368
4 votes
1 answer
170 views

How can someone asleep recognize a very brief sound?

I have a snoring girlfriend. To interrupt her snoring, I make a sound similar to the very brief sound gas makes when opening a soda can or bottle (had a snoring brother, I know this technique works ...
Max's user avatar
  • 43
4 votes
2 answers
561 views

Do neurons fire at a faster rate during dreaming?

When I dream it seems that the (subjective) time is slower than the objectively passed time as seen on my clock radio. Is this because neurones fire collectively at a faster rate, so you can "put an ...
Deschele Schilder's user avatar
4 votes
1 answer
152 views

How are real life events translated into dream symbolism?

I'm interested in how significant events from daily life get encoded or translated into dream content. A personal observation can help clarify my question: I've observed that for me, "significant, ...
Alex Stone's user avatar
  • 9,390
1 vote
0 answers
302 views

Reason for experiencing electric current flowing through body during sleep from top to bottom [closed]

I know about sleep paralysis and there is several information about it, available over literature. Sleep paralysis is a temporary inability to move or speak that occurs when you're waking up or ...
hanugm's user avatar
  • 251
1 vote
1 answer
372 views

What is the effect of Daylight Saving Time on attentiveness and productivity?

This weekend the clocks were set an our later (in some countries), such that the daylight lasts an hour longer in the evening. This has several reasons, among which a reduction in energy consumption ...
Robin Kramer-ten Have's user avatar