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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Can somnambulism be self-induced?

Can somnambulism be self-induced? By "self-induced" I mean when a person starts in the waking state, induces sleep, and then takes themselves down into a deep sleep where somnambulism occurs,...
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3 votes
1 answer
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Are brainwaves from an EEG meaningful measurements?

I realized that research describing the different stages of sleep all rely on the assumption that we can accurately determine the stage of sleep using an EEG. I wondered if brainwaves are anything ...
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1 vote
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Why don't we wake up from thirst?

Usually, we sleep up to 7-10 hours. A healthy human drinks 2-3 cups per hour. Why don't we wake up from thirst if during the day, it is normal to drink so much? I don't think that this is because you ...
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6 votes
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Can our dreams tell us anything useful about ourselves?

This question is related to What is the current "accepted" science behind dream interpretation?, but here I am asking something more specific. Dream reports, also known as sleep mentation ...
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Can the chronotype by changed to become a morning person without affecting quality of sleep?

Human chronotype is determined by age and genetics (PER3) Most of common advice for those who want to become a morning person goes towards slowly adapting wake up time, and habits / environment (...
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2 votes
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What happens when a person lowers their sleep to less than 3 hours a day? [duplicate]

If 6-8 hours would be required for a adult, how would less than 3 hours affect the person long term? If they can function well with less than 3 hours of sleep in the short term.
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3 votes
1 answer
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Is being a morning person vs a night person actually a real thing or just a preference?

Are there real physical differences between a morning person vs a night person that can be measured and used to explain the difference? Or is it just an adapted preference randomly varying from person ...
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0 votes
1 answer
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Near-dream states producing closed-eye visual rendering of the environment

Sometimes when I'm about to fall asleep, or have slept but not fully awakened, I experience a weird phenomenon. I'll describe it with a recent example: I had come home from school, and it was still ...
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Change in perceived direction of body when laying in bed [closed]

Sometimes when I lie in bed, with my eyes closed, I get the sense that my head is actually at the bottom of the bed, where my feet usually are, when I know it is still resting on the pillow on the top ...
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1 vote
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Sleep/Dream and Logical Decisions

I discovered that sleep tends to mitigate the 'stress' that one gets by trying to deal with logical problems like work related tasks and general daily life tasks. Does sleep do this by removing the ...
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Effects of Red vs. Green ambient lighting on sleep

I would like to know if there has been study on the difference of effect of red vs green ambient light on human sleep. This is specifically in the interest of choosing between red or green alarm clock ...
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2 votes
1 answer
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What evidences this technique of visualizing different color words in sequence, to help you sleep?

What's this technique called? Any evidence? I'll make it easier. Visualize the word Red. In big red letters. Examine your creation but don't judge harshly. After a few seconds, switch to the word ...
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2 votes
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Is there research evidence to suggest that waking up slowly is more beneficial than waking up abruptly?

There are several articles I've found which seem to anecdotally back up the suggestion that waking up slowly is better than waking up abruptly, in terms of combatting sleep inertia: https://www....
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Is Melatonin necessary to sleep?

Consider a scenario where a person's melatonin secretion gets inhibited (and that person also don't get external melatonin); Will this person feel sleepiness and a desire to sleep? Or, since that ...
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Mean brainwave amplitude

When measuring nocturnal sleep for a person that has narcolepsy using an EEG a distinctive lack or reduction of slow wave sleep activity is indicated. Slow wave sleep brainwaves are the brainwaves ...
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3 votes
3 answers
322 views

How effective is lying down with eyes closed as a substitute for sleep?

Resting, as opposed to sleeping, helps with physical recovery and relaxation, but much of the benefit of real sleep is mental. If I can't sleep, how much, if any, sleep-related benefit is gained by ...
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2 votes
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How does Free Running Sleep Disorder (FRSD) in humans get treated as of 2020s?

From reading accessible information about Free Running Sleep Disorder (FRSD) in humans, I understand it is a chronic and cyclic sleep disorder of a totally unentrained 24-hours circadian rhythm. ...
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1 vote
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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 ...
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How does a nap affect nighttime sleep duration?

How does a nap of the kind that is often recommended – that is, early afternoon and no more than 30 minutes – affect nighttime sleep, especially the duration of nighttime sleep, but also its quality? ...
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2 votes
1 answer
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Does sleep-talking typically happen during NREM or REM sleep?

I have observed some of my mother's sleep-talking and have even attempted to reply / speak to her during such episodes. In my experience, I have found sleep-talking to be a part of her dream. In some ...
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4 votes
2 answers
336 views

Research shows that doing anything in bed other than sleeping can disrupt sleep. What if these other things are done on another bed?

I read this and some other articles stating that you should not do anything in bed except sleep. This includes studying, eating, and watching T.V, because your brain will have a difficult time ...
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2 votes
1 answer
2k views

Does our consciousness die when we go to sleep or fall into a coma?

I have sometimes wondered if our consciousness dies when we go to sleep at night or perhaps when we enter a deep coma, like from brain damage, for example. When we wake, or are woken, a new ...
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7 votes
2 answers
161 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 ...
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3 votes
1 answer
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Can meditation be associated to lucid dream?

The principal reason of this question is that I know people that can willingly enter in lucid dream (and so do what they want in it, and wake up when they want). Some of then use EEG (not ...
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Why people feel more sleepy while doing something that's not interesting even when they are not actually tired?

We often see people and students yawning while reading a boring course book. But, when told about something interesting, their sleepiness vanishes. Why and how does this happen? What are the exact ...
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1 vote
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What thoughts should one contemplate to minimize sleep latency?

While trying to fall asleep on night, I was wondering what my strategy would be if I was challenged to a competition where the goal was to fall asleep as fast as possible once I was lying in bed. The ...
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3 votes
1 answer
63 views

Is there consciouness when a person is sleeping and not dreaming?

According to Consciouness Consciousness is the state or quality of awareness or of being aware of an external object or something within oneself. I suppose dreaming qualifies as "being aware ...
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1 answer
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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 ...
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6 votes
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While dreaming, are memories replayed faster or slower? [duplicate]

In Chapter 3 of his book Why We Sleep: Unlocking the Power of Sleep and Dreams, Matthew Walker explains "time dilation in dreams": One last temporal distortion deserves mention here—that of time ...
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1 answer
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NREM sleep and REM sleep

Why is the first stage of sleep non-rapid eye movement (NREM) sleep, and why does rapid eye movement (REM) not happen during this first stage, although we remain partially awake?
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1 vote
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What causes the lack of focus due to sleep deprivation? What are the outcomes of this?

When one is sleepy and one attempt's to work on something cognitively demanding, such as doing algebra in one's head, or trying to imagine a house's interior in detail, what causes the "resistance" to ...
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2 votes
1 answer
165 views

Can dreams predict the future? [duplicate]

On Quora there is a discussion that dreams can predict the future. I have experienced the feeling that things happening to me in real-life had occurred in my dreams, before these events actually ...
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1 vote
0 answers
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How come sleeping during the day induces lucid dreaming and sleep paralysis later on at night? [closed]

I've noticed that when I sleep during the daytime (even if it's for as little as 5 minutes), later on that night I won't simply fall asleep normally. I'll begin to fall asleep aware of the entire ...
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0 votes
1 answer
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Why might sleeping on the floor alleviate PTSD symptoms?

Question: Does sleeping on the floor have similar neurotransmitter effects, as sleeping under a weighted blanket might? Psychiatrically, would it be expected that a person having PTSD would find ...
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3 votes
0 answers
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What would be areas of ethical or safety concerns with a smartphone app interacting with people sleeping?

The BBC News article Hi-tech dreamcatcher defeats sleep amnesia mentions a recent talk by Adam Haar Horowitz and then describes some limited tests of an apparatus called Dormio at the MIT media lab, ...
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1 vote
1 answer
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Why didn't I wake up after dying in a dream? [closed]

So I found a lot of articles about the facts why death in dream wakes us up, like that our brain doesn't know what happens after death, or because of the adrenaline and so on... I had two dreams in my ...
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3 votes
0 answers
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Why does daylight-saving have such a big impact on us and weekends don't?

Last weekend, at least in Germany, the clock got switched from 2:00 AM to 3:00 AM. Today I found a few articles, that suggest, that the daylight-saving has a big impact on people. Judges punish ...
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0 votes
1 answer
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Why am I sometimes astonished when I doze [closed]

Why am I sometimes extremely astonished with no reason when I doze, especially I am really exhausted? When I am tired and doze, I am sometimes stunned so suddenly that my whole body shakes and ...
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4 votes
1 answer
3k views

Difference between drowsiness/sedation and sleepiness

I have been trying to understand the difference between drowsiness/sedation and sleepiness. The only article I was able to find that partly answers my question is "The difference between sedation and ...
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-1 votes
2 answers
106 views

Is there a known mechanism by which people fall asleep less easy after watching TV?

It's my experience that people (I am one of them) tend to fall asleep while watching television. Afterwards, when lying in bed, sleep doesn't come as easy as when they were watching television. Is ...
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2 votes
1 answer
78 views

Does dreaming cuts our sleeping hours?

If I am dreaming a lot at night, how many effective hours am I sleeping at night? After dreaming heavily at night, when I wake up in the morning I feel sluggish as if I haven't slept properly. Does ...
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0 votes
1 answer
40 views

Are there any long term cognitive impairments from prolonged period reduced sleep? [closed]

What are the consequences of chronic lack of sleep? For example, insomniacs are known to sleep less than normal sleeping individuals. I am wondering if there are any long term cognitive impairments ...
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6 votes
1 answer
183 views

What is the cause of frequent nightmares?

Is there a reason why people dream of demons, ghosts, and other scary creatures? More specifically: What factors cause frequent nightmares to occur?
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3 votes
2 answers
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Sleep vs. Trance

I've been recently reading about hypnosis and I'm asking this question because I've had certain personal experiences that makes me confuse the term Trance with just simple sleep. I'm not a fan of ...
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2 votes
1 answer
137 views

Can we interconnect with other people mentally during dreaming? [closed]

In some of my dreams, I have seen people that I know, and I ask them about it the day after and they say that they saw me too. My older sister said that she had exactly the same dream as one of her ...
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5 votes
1 answer
187 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 ...
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3 votes
1 answer
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Can you Counteract the Negative Effects of Sleep Deprivation?

There are many studies accounting the negative effects of sleep deprivation which all seem to detail the deficiency of time for your body to "reset" and how this leave it in a depleted state. If you: ...
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1 vote
1 answer
781 views

Is our sense of smell heightened when we are asleep?

My question is whether our sense of smell is stronger when we sleep? From an evolutionary perspective this could have been beneficial in terms of runaway camp fires, marauding saber tooth tigers or ...
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3 votes
1 answer
344 views

Understanding Melatonin

Is my understanding roughly correct? Melatonin is 'generated' in the absence of specific wavelengths of light. It accumulates and is only reduced by sleep, in particular REM sleep. Melatonin and ...
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4 votes
2 answers
409 views

For an average adult, in general, if one knows they will wake up in the middle of a cycle--is it better to go to bed later?

Let us say that one consistently goes to sleep at the same time every day, and sets an alarm for the same duration of sleep 7 hours and 45 minutes (e.g., 10:45pm to 6:30am). One day, they get caught ...
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