No: It is not your body only. External celestial objects play a role.
Answered 7/6/2014
3.9k views
It may help: you should try and look up zeitgebers. They are what help to entrain us to our 24 hour circadian rhythm. Light is the strongest of zeitgebers, however there are some medications that may help. keeping a regular bedtime/wake time and meal times may also help.
Answered 4/2/2016
3.8k views
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