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10 Nov '17

sleep facts.

Posted by Benjamin Crudo
Sleep plays an important role in your physical health. For example, sleep is involved in healing and repair of your heart and blood vessels. Ongoing sleep deficiency is linked to an increased risk of heart disease, kidney disease, high blood pressure, diabetes, and stroke.Jun 7, 2017
Why should we sleep?
Researchers have also shown that after people sleep, they tend to retain information and perform better on memory tasks. Our bodies all require long periods of sleep in order to restore and rejuvenate, to grow muscle, repair tissue, and synthesize hormones.
What is the adaptive theory of sleep?
Evolutionary theory, also known as the adaptive theory of sleep, suggests that periods of activity and inactivity evolved as a means of conserving energy. According to this theory, all species have adapted to sleep during periods of time when wakefulness would be the most hazardous.
Why do we sleep at night and not during the day?
This resides in our Brain which dictates when to sleep and when to wake up. The sleep and wake up cycles are controlled by a hormone named Melatonin whose secretion inhibits in presence of light. So if someone wants to reset his internal clock Exogenous Melatonin can be used.
Why do you have to close your eyes when you sleep?
In Unihemispheric sleep, half the brain is asleep and the other is awake. ... Closing eyelids during sleep allows a prolonged contact between the cornea and tears killing resistant bacteria in the process. The action of the tears during blinking is not sufficient to completely get rid of the foreign bodies in the eyes.