Sleep too little and then take a nap during the day instead. Then the body's rhythm get out of order. You'll guaranteed be tired and angry and maybe eats some in order to get refreshed. Sleep Debt also makes you a little less smart.
We depend on the body clock for our survival. Sleep is needed to repair the body and soul. Anyone who does not sleep eventually die.
The environment helps us to set the body clock , primarily through alternation of light and darkness.
If we isolate from the outside world the clock continues to tick - but in a different tempo. It is different compared to the watch and calendar. NAturally, you would create a sleep/activity-cycle that is longer than 24 hours.
The more an evening person you are, the longer day you create. The majority create a cycle that is 25 hours, some still up to 28 hours
Humans are diurnal, born to be active during the day. We have poor night vision. Our circadian wants to control us to be alert, active and eating during the day. At night we should sleep and fast.
Läs mer bl.a. på http://www.vetenskaphalsa.se/den-biologiska-klockan/
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