Questions tagged [circadian-rhythms]
Any biological process which displays an endogenous, entrainable oscillation of time.
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Why are fearful stimuli more powerful at night?
For example, horror movies appear to be scarier when viewed at night than during broad day light.
Does light have any role in this phenomenon?
Are there changes in hormones at night versus during ...
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How is human biological clock modelled in modern science?
Im an engineer by education and i program a lot, so the question sounds weird to people from other disciplines.
Im trying to better understand the human biological clock. Yet i do not really know ...
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Why is maintaining a circadian rhythm important?
What are the real consequences of never maintaining a circadian rhythm?
How is circadian rhythm important for health and function? Where did it arise in evolution?
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Is the human biological clock genetically programmed or learnt?
Argument favouring learning:
A newborn sleeps for 20-22 hours. But overtime (s)he learns to focus sleeping time to night time, according to his or her needs and family needs. Some sleep from 1 am to 7 ...
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What light intensity starts melatonin release in humans?
I'm interested in whether any studies have determined the intensity of light at eye level that starts melatonin release in humans.
I know that:
melatonin release is suppressed by blue light with ...
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Do men have significant hormonal cycles?
I know there's a similar question here. But that discussion dissolved into lunar cycle and a correlation with it. I want to find more towards the original question of is there a periodic hormone ...
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What causes adenosine build up in the brain when awake?
Adenosine is an important hormone in sleep regulation. It is postulated that when a person is awake, there is a build up of adenosine in the brain, which inhibits the neurons in the brain, and ...
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What can the timing of human urination tell about the human's physical condition and circadian rhythms?
I've noticed a peculiar phenomenon. A subject drinks 400 ml of water, then observes time until the urge to urinate is felt. The time is 15 minutes. The subject releases water. 14 minutes later another ...
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Human sleep cycles and dream times, what influences the timing and intensity? Sleep history included
I'm doing sleep and dreams research and have developed an iPhone application to help me track my bedtime, rise time, sleep onset and also mark dreams. The app also monitors overall activity overnight ...
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Is it possible to live without health problems sleeping one day and not the other?
Basically, I want to know if it would be humanely possible to sleep one day, skip the next, sleep, skip, sleep, skip, etc, with a 8 hour sleep time.
If you need any extra information, let me know.
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Is there a normal human melatonin concentration to light level curve?
I'm looking for a graph or a curve that would show the typical concentration of melatonin in blood or saliva for humans over 24 hours. It would be good to know the photoperiod for the same human as ...
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How do humans perceive time?
We can see length, and other physical quantities. We can perceive through our other senses like (temperature through thermoreceptors, weight through pressure receptors etc.). But how do we "sense" ...
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