Questions tagged [sleep]

The biological process characterized by reversible unconsciousness, unresponsiveness to external stimuli and motor passivity.

Filter by
Sorted by
Tagged with
0
votes
1answer
70 views

When we're tired, what do we run out of, really? Sugar? [closed]

As a mechatronics engineer, I kind of see the human body as a power plant that works on food, which is more or less producing a constant power, has some sort of power averaging capability like a ...
0
votes
1answer
174 views

What are the essential criteria for sleep in living organisms?

I was reading this fascinating article about how sleep evolved before brains, and it got me thinking "can plants sleep" and "what is sleep anyway". A line in the article states: ...
5
votes
2answers
93 views

Why do morning people have shorter biological clocks?

First of all, we all have a circadian clock than is run endogenously by differential gene expression and controls our change in awakeness, temperature, hormone levels, etc.. Circadian clocks are not ...
2
votes
1answer
129 views

How do people wake up just before their alarm goes off?

I can wake up less than 2 minutes before my alarm goes off regularly. I read the common wisdom on the subject which says "circadian rhythm; PER proteins; internal clock". I am skeptical of ...
3
votes
2answers
165 views

Is once per day the optimal sleep pattern for all mammals?

If a typical human body clock is 8 hours sleep, 16 hours awake, interested to know if any mammals have: a 12 hour body clock (4 hours sleep, 8 hours awake) a 6 hour body clock (2 hours sleep, 4 hours ...
5
votes
0answers
43 views

Parts of Brain Active for Dreams | Right Hemisphere or Cortex

I found a research that states cortex is responsible for the contents of the dream. Contents could be people, place, objects etc. The cortex is responsible for the content of dreams, including the ...
4
votes
1answer
168 views

Why is Sleep apnea only risk to males?

I was reading this article. In Risk Factors, it clearly mention "Being a male". Why is Sleep apnea only risk to males?
3
votes
0answers
856 views

Why do we feel sleepy when we wake up

Why do we feel sleepy, tired, and feel like we need to sleep more when we wake up? (Like, is there a special chemical in the brain that causes that?). Are there any ways to wake up without feeling ...
2
votes
0answers
18 views

Do circadian hormones fluctuations follow sleeping patterns or the time of day?

It is said that testosterone and cortisol are at their highest early in the morning, at 8 am, and lowest at night. What happens, though, if someone regularly goes to sleep at 8 am and wakes up in the ...
2
votes
0answers
57 views

How does sleep prevent our eyes from drying out?

If we don't sleep for about 16 hours, our eyes start to get dry, and no amount of eye drops helps. You use eye drops and then you're dry 10 minutes later. However, after you've slept for 8 hours, your ...
2
votes
0answers
17 views

Do lack of sleep affects the process of digestion? [closed]

Many times due to lack of sleep I felt discomfort in digestive tract.Why did it happen?Do lack of sleep affects the process of digestion?
5
votes
4answers
856 views

Why do we dream while sleeping?

Is there any specific reason behind why we dream? Why do we sometimes get weird and unusual dreams? Sometimes we can't even recall what we dreamt of. Why does this happen?
2
votes
1answer
91 views

What is the function of dreaming? Does a particular hormone secretion interfere with dreaming? Why do some people dream more?

I'm really interested to know when we are sleeping how a series of stories come to our mind that we called this process dreaming. If you know a useful article on this topic, please tell me thanks.
5
votes
1answer
3k views

Can a lack of sleep degrade balance?

For years, I've noticed that the day after a night of poor sleep (4 hours or less), my balance noticeably degrades. For instance, while walking 20 feet to the coffee maker, I might stumble into the ...
1
vote
0answers
35 views

Can sleep be a barrier against aging?

I know that what I'm writing about may be a little strange, but as far as I know,when we are asleep, our human body is programmed to carry on biological functionalities in a really optimized way and ...
4
votes
1answer
2k views

Is it possible to have sleep paralysis while sleepwalking?

At least from a conceptual level, these two disorders don't conflict. The effect of sleep paralysis is being conscious while having the inability to consciously direct motor functions. Sleepwalking is ...
11
votes
1answer
146 views

How fast do we fall asleep?

When looking at the process of sleeping, most research I find point to a group of mutually inhibitory cells which form a sort of biological "flip flop." There's cells that promote awakenness and ...
0
votes
0answers
26 views

Why do cats sleep in a curled up position?

I've noticed that cats will usually sleep curled up like ball, heads down and titled, with tails near their face. Is there any specific reason that cats would have a tendency to sleep this way?
26
votes
2answers
5k views

Does sleeping fewer hours than needed cause common cold?

Does sleeping fewer hours than needed cause the common cold? If so, how?
-4
votes
1answer
86 views

Why have we evolved to snore yet find snoring so annoying?

Human's snore. I doubt this is a new occurence over the last millenia. I find it hard to believe that for the past million years, no human ancestor has been a snorrer. And yet, the sound of snoring ...
91
votes
4answers
7k views

Why did the process of sleep evolve in many animals? What is its evolutionary advantage?

The process of sleep seems to be very disadvantageous to an organism as it is extremely vulnerable to predation for several hours at a time. Why is sleep necessary in so many animals? What advantage ...
8
votes
2answers
873 views

Why do we sleep?

While we do know that the human body is regulated by a circadian clock that keeps humans on a sleep/wake cycle, we don’t really know why. Sleep is the time when our bodies repair tissues and perform ...
12
votes
3answers
3k views

How are our senses dimmed during sleep?

Our senses are not as sensitive during sleep compared to wake. There is an arousal threshold during sleep that only when it is overcome will it wake a person up. My question is how is this arousal ...
2
votes
2answers
199 views

What is "integrated spindle activity" in plain English?

From a research article: To determine if a combination of spindle parameters allowed for a better group discrimination, integrated spindle activity (ISA) was calculated by integrating over time ...
1
vote
0answers
33 views

What happens to eyelids when we feel sleepy?

Why is that whenever we feel sleepy, our eyelids start to feel heavier. It is not like we can any time close our eyes and will immediately fall asleep. But, when we feel sleepy our eyelids ...
0
votes
0answers
23 views

Is it possible for a human being to live on a different day cycle?

I am considering writing a story where a character lives on a 30-hour day cycle. That is, this person sleeps for 9.5 hours and is awake for 20.5 hours. Then this person repeats the schedule. I'd ...
4
votes
3answers
742 views

What is the term for awareness of or inclusion of real sounds within a dream?

I fell asleep while listening to a podcast, and I am sure I was dreaming but I could also still hear the podcast. The podcast played an important role in the dream, I was searching for the source of ...
10
votes
1answer
13k views

What's the technical difference between fainting (and being unconscious) and falling asleep (and sleeping)?

This is actually a popular question along google results but the answers usually sound like: sleep is voluntary (oh is it?) and healthy fainting is result of accident and is not normal I read those ...
1
vote
1answer
61 views

If mammals evolved to be nocturnal, then how did we get so staunchly diurnal in such short time?

Much of human health revolves around sleeping well through the night. We know about circadian and body temperature rhythms which make us sleepy at night, peak melatonin production in the middle of ...
6
votes
1answer
7k views

Is there a link between digestion and nightmares?

A common belief is that eating too much before going to sleep can cause to have nightmares. In fact, I often experience it: I systematically have nightmares after eating too much in the evening. ...
4
votes
2answers
4k views

Can adenosine be cleared?

I've been thinking about this question for awhile, since reading this question: What causes adenosine build up in the brain when awake? We know that a couple of things will block adenosine receptors: ...
2
votes
1answer
16k views

Serotonin - Does being aroused make you sleepy?

My Psychology text book says Serotonin causes "Sleep, arousal levels and emotion" Does this really mean that when you are being aroused, Serotonin is released, which in turn makes you sleepy? If so, ...
1
vote
1answer
590 views

Why do we fall asleep when our eyes are closed?

Why do we fall asleep when our eyes are closed? When we lie down with our eyes closed, eventually we'll fall asleep. Why is that? Is our eyes closing some sort of trigger to our brain that says it's ...
4
votes
1answer
5k views

How loud a sound would need to be to wake someone up?

I have been researching about this and it looks like the term would be auditory arousal threshold. Imagine you fall asleep while listening to music with earbuds. Out of a sudden, the device starts ...
1
vote
0answers
17 views

Would an h1 Full Agonist Prevent Sleep

According to Wikipedia the h1 receptors stop firing to effectively manage sleep. Assuming I understand how blocking and non blocking receptors work would a full agonist on the h1 receptors ...
3
votes
0answers
101 views

Can low melatonin levels and/or LED lights cause or exacerbate macular degeneration?

I have two questions that may or may not be interconnected. My first question is: Does melatonin prevent macular degeneration? Could low melatonin levels (caused by blue-rich light exposure in the ...
1
vote
0answers
34 views

Delay of sleeping on cortisol cycle

I was told that cortisol has to be measured at 9am or 4pm, because those where its peak level. But I wonder if changes on sleep patters affect the cortisol cycle. I mean, if I usually go to sleep ...
5
votes
2answers
279 views

What in the brain has gone awry during sleep paralysis?

I experience episodes of what I assume is sleep paralysis (lasting ~ 10-30 seconds) a few times a year, where I'm conscious of being somewhat awake but unable to move. I can hear, but not see, and am ...
5
votes
2answers
267 views

Melatonin production, sleep, and "cyan light"; how might this finding be possible?

The BBC News article Cyan colour hidden ingredient in sleep describes research that suggests melatonin levels as measured in saliva could be affected by the presence or absence of cyan color in a ...
18
votes
1answer
74k views

Do humans sneeze or cough in their sleep?

As far as I know, I've never seen anyone sneeze or cough while they're sleeping. Google wasn't very helpful either; a lot of contradicting claims. So the questions remains: do humans sneeze or cough ...
9
votes
2answers
601 views

What's the worst that can happen from too much sleep deprivation? Can you die?

It is well known that sleep deprivation causes considerable discomfort in humans (and has even used as a form of torture), but nevertheless there have been people who went through protracted sleep ...
0
votes
0answers
79 views

Sound volume drop when falling asleep in an airplane

Note: This question has nothing to do with pressure change. When I'm flying in an aircraft at cruising altitude, the monotonous sound often lulls me to sleep. I've noticed that just as I am on the ...
11
votes
2answers
1k views

Why sleep? No, actually, why wake?

I was just reading the sleep threads, and I wondered, why is the body so constructed so that sleep is necessary? (Is it just a design error?) But then, how do things come to be awake at all? How did ...
10
votes
2answers
2k views

Why do some people become more aggressive when tired?

Why do some people become more aggressive when they are tired? I've been thinking about this question for a few days and my 'hypothesis' is that the neural activity in the prefrontal cortex lessens as ...
2
votes
1answer
560 views

Is there a difference between sleeping late and waking up late vs sleeping early and waking up early?

For example, if I sleep at 1 AM and wake up at 10 AM, will it negatively affect my health opposed to sleeping at 10 PM and waking up at 7 AM?
4
votes
2answers
441 views

Can our body adapt to periodic fluctuations in sleep?

Suppose that if I've to attend a morning class then I must wake at 5 AM in morning. Next, if I don't (attend the class) then I wake up at 7-8 AM. I've experienced that, since I do attend those ...
1
vote
0answers
15 views

Can varied temperature while sleeping help quality of sleep?

I read an interesting article which is about relations between body temperature and quality of sleep. I'm interested in the phrase from the article. Other experiments that varied the ambient ...
13
votes
1answer
34k views

What senses are active while sleeping?

During sleep, our body activity decreases. I am wondering on the extent of the lowering of this activity regarding our five senses. Clearly, the sense of touch is still very efficient since shaking a ...
0
votes
2answers
109 views

Do Vaccinium membranaceum plants need a minimum amount of darkness per 24 hours?

I have Vaccinium membranaceum (black huckleberry) seedlings growing in a greenhouse. I have the option of providing fluorescent light to the plants 24 hours a day. However, it has occurred to me that ...
2
votes
0answers
44 views

Does the brain always enter alpha/beta waves upon brief awakenings during the night?

If you realize you are awake briefly before falling back asleep, have you necessarily exited REM sleep or another stage? That is, is the experience of waking briefly (tossing and turning, etc.) always ...