Questions tagged [sleep-cycles]

Questions pertaining to patterns of sleep.

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19 views

I got by on 2 hours of sleep today. How is that possible? [closed]

I usually sleep for 7-9 hours a day. Recently changed it from a day sleeping schedule (05:00 A. M. To 13.00 P. M.) to night one (24:00 midnight to 09:00 A. M.) Yesterday was Friday, Indian standard ...
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80 views

Sleeping during the day instead of sleeping at night

Is there any difference to ones health outcome if they wake up at night and go to sleep when the sun rises up? To be more specific, what will happen to a person if the sleep cycle is reversed?
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72 views

Is there a medical problem of too much REM sleep?

I understand that human sleep has a cycle of five stages that can repeat itself several times (depends on how long one sleeps); these are named based on the fifth stage occurring about each 90 minutes ...
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2answers
119 views

How much melatonin does the body produce naturally per day?

Melatonin supplements are readily available over-the-counter. However, the dosage is not regulated and there are supplements available in a wide variety of doses. Information on how much melatonin ...
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0answers
25 views

Earlier wake-up times in older people

Many studies led to the conclusion that the internal body clock period (circadian rhythm) is actually closer to 25 hours; that is, the clock was thought to drift toward a 25-hour day unless it is set ...
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1answer
46 views

Which impacts one's sleep more - waking up towards the beginning of a sleep cycle, or the end?

Imagine someone wants to go to sleep at midnight and wake up at 7.30 am, so that they get an ideal five sleep cycles (7 1/2 hours). First scenario: they go to bed at 11.30 and fall asleep within 15 ...
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121 views

Can excessive Vitamin D cause insomnia or damage sleep patterns?

It seems its well known that low vitamin D can cause sleeping issues, one link: https://examine.com/nutrition/can-supplemental-vitamind-improve-sleep/ Therefore, I became curious and was wondering ...
2
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1answer
67 views

Does a computer screen work as a lightbox?

We often hear two related facts: That using a lightbox can help maintain one's circadian rhythm. That using a computer late a night can make it harder to sleep at night due to the blue light emitted ...
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53 views

Why do we sleep? [closed]

I was reading many things about sleep. But I am very curious about knowing why do we sleep. Is it only for trashing out toxic materials or is it anything else?
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27 views

Is it good for health to regularly do a nap and divide sleep into two?

I am trying to adapt to biphasic sleep. I would ideally do something like 00:00 - 06:30 and a nap from 15:30 to 17:00 (Or the sleep amount that I require to fulfill my sleep needs). I have been ...
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34 views

Why do teenagers produce their melatonin later than everyone else

Does anybody have a theory why this change happens to teenagers? Everything I have read agrees it does happen, but nobody seems to suggest a reason why this has evolved. Biology’s cruel joke goes ...
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1answer
62 views

Does caffeine boost adenosine buildup?

Caffeine blocks adenosine receptors, thereby reducing the effect of adenaline. It seems plausible to me, that blocking adenosine receptors should (perhaps ironically) increase the rate of adenosine ...
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1answer
90 views

When should we sleep?

Is sleeping every day from 4 am to 10 am is equivalent to sleeping from 12 to 6 am at night? Also, what is the best time to go to sleep at night? And how many hours of sleep is necessary for good ...
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20 views

What are the effects is a person has a regular amount of Deep Sleep and REM sleep but a lot less Light Sleep?

It's commonly said that it's important that we get enough total sleep time. I however wonder how important the time in Deep Sleep and REM happens to be. What are the effects when a person has a ...
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0answers
35 views

What effects can be expected for a 15-year old girl getting 4-5 hours of sleep per night? [closed]

Say a 15-year old girl on average falls asleep around 3am and wakes up around 7am, over a very long period of time. What short-term and future mental/physical effects can be expected?
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1answer
52 views

What happens to melatonin and the circadian rythm when one adopts biphasic sleep cycle?

I have read that the sleep cycle is driven by melatonin, and that there is a natural 24h "sine-wave" of melatonin, where during the day, melatonin is at low levels, while during the night, it is at ...
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44 views

What is sleep pressure?

What is sleep pressure? I was reading an article on melatonin, and one of the commenters said something about 'sleep pressure'. I did a web search to see what it was, but web searches don't often ...
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2answers
88 views

Sleeping 6 hours discontinuously every day

During the last year I think the 90% of the times I can't sleep for more than ~4.5 hours continuously (which corresponds to ~3 cycles), then I'm awake for ~30 minutes trying to sleep, but if I fall ...
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132 views

How does the heart rate change during REM and non-REM stages?

I read different references and I understand that the average heart rate during sleep decreases by some beats per minute. The heart rate is slower in non-REM stage than REM but I found no measurements ...
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18 views

How can I evaluate my sleeping habits based on a Fitbit Charge HR (or similar)?

The Fitbit Charge HR allows one to track their sleep by continuously monitoring motion and heart rate. It uses algorithms to infer when its user falls asleep and when they wake. The next morning, ...
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4answers
105 views

How to get to sleep half-an-hour / an hour earlier than the day before?

Please only state ideas that have personally helped you, in your daily experience, not a hypothetical answer from a website, that might be helpful. I have had major problems with sleep at least since ...
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1answer
22 views

Do hearing-impaired individuals need more sleep?

I'm a hearing-impaired individual, but because I was born with this disability, I never researched it because it was never "new" and "exciting" to me, but a friend recently informed me that hearing-...
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52 views

Teenagers sleeping patterns and parents actions (force or let-go)

My daughter (15 years old) is very active and full of energy until she hits the sac. After five minutes she's out. This represents the perfect behaviour for bedtime process. But, she does this at 1:00 ...
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2answers
186 views

Why do I feel more tired when I sleep in?

I almost always feel more tired after sleeping in. For example, If I go to bed at 12:00am and wake up at 6:00am to an alarm, I feel somewhat tired, but after showering and eating breakfast, I ...
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0answers
36 views

Why do we sleep more in certain countries than in others?

I moved to Canada 6 months ago and as soon as I got here I noticed that my sleeping habits had changed dramatically. Indeed, I sleep much more than I used to. I've always been insomniac and so I used ...
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46 views

What are some potential causes of idiopathic hypersomnia?

I have been using Google scholar to try to find information about idiopathic hypersomnia. I am struck by the fact that no papers even attempt to provide a pathology (or possible pathologies). Clearly, ...
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1answer
203 views

Does less sleep lead to weight loss?

Sleeping less at night time leads to sleep at morning. Does this less sleep lead to weight loss ?
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84 views

Does Blue light filters in smartphones really work?

Since this is more of a health related question, asking this here is preferable than other sites. So, does such apps really do not disturb the production of melatonin? Does Blue light filters in ...
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19 views

Does maintaining your home's time zone, while travelling, enable you to evade jet lag?

Suppose that: You are leaving Home, travelling to Destination for 1-14 weeks, and then returning Home. Destination time is behind Home time by ≤ 6 hours (contra this). Obviously, this question is ...
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1answer
178 views

Can oversleeping be harmful to overall health?

Is it worse than undersleeping, especially for healthy development? Does it have any benefits? I would like to know both physical and mental effects (or diseases?).
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106 views

Any advice to sleep 7-8 hours?

I have 24 years, I am in this forum for suggestions, I've never had trouble sleeping, but last year I slept badly because I didn't prepare well for tests and I almost always had to study the last days ...
6
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2answers
200 views

Is setting your alarm for a long duration at a lower volume a good way to ensure you wake up in light sleep?

I usually set my alarm really loud so that I will definitely wake up. Usually that is accompanied by disorientation, headaches, etc. However, I read about 'completing the sleep cycle' and that it ...
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2answers
173 views

Are there permanent health effects from working the night shift for 6 days? [closed]

Could there be any permanent health effects form working 12 hour night shifts for 6 days in a row (10 pm to 10 am)? Especially on the brain?
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2answers
75 views

Can humans acclimate to longer or shorter days?

After watching The Martian, I had falsely assumed that a day on mars is significantly longer than on earth, but it is actually only 40 minutes longer. However, the question for me still remained: Can ...
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1answer
276 views

How much sleep is too much?

As I have understood from reading stuff on the internet and talking to people, too little sleep can have very serious health problems and you need to sleep at least 6 hours every night. what I don't ...
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142 views

What factors affect sleep propensity?

What environmental and personal factors affect the amount of time it takes to fall to sleep? How can some people go to bed in 5 min where others take an hour? Some factors I’ve thought about include: ...
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1answer
218 views

how can I get my sleeping cycle to normal again?

in my job I have no official known work hours ,when they call I have to go to work no matter what hour it is (should've red the contract before I signed it right :-D ),this make me lose my sleeping ...
13
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2answers
291 views

Reversing sleep cycle

I have been a nocturnal for some period of time and thus altering the sleep cycle seems difficult i.e. moving back to the normal 10 to 5 sleep cycle. What can be done to revert back to the normal ...
10
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1answer
133 views

Are there any hazards associated with changing sleep schedules (shift work)?

One of my friends works on rotational shifts (if she works a week during the day, another week she needs to work during the night). Her sleeping cycles are changing continuously. Will this cause any ...