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There is a physiological mechanism called the 'biological clock' which controls your sleep wake cycle, various body systems ... and even your moods. The biological clock is a prime mover in those 'circadian rhythms' which refers to an internal clock within our brains which controls various essential functions and bodily processes.
Today is Biological Clock Day. It is observed each April 28th in an effort to to raise awareness about our circadian rhythms and their impact on our sleep-wake cycle, body system, and mood.
If there are functions which eventual cease, like fertility, rest assured this is primarily due to the 'biological clock' of the individual affected.
When I was young I never napped. I viewed it as a function of the aged having seen my grandfather napping all the time on his cot in the dining room. Nowadays, I find myself seeking a nap ... or two on most days. I attribute this to a diminished amount of exercise and while I am working on that aspect I feel sure my biological clock likewise is coming into play.
So Be aware of your circadian rhythm and therefore your biological clock. Try not to let it slip up on you.