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One of the most striking changes over the past several decades has been the emergence of issues as political controversies.
Days
Units of time equivalent to 24 hours, representing the approximate period it takes for the Earth to complete one rotation on its axis.
Sleep
A naturally occurring condition of the mind and body where consciousness is altered, sensory activities are largely reduced, and almost all voluntary muscles are inhibited.
Circadian Rhythms
Biological processes that display an endogenous, entrainable oscillation of about 24 hours, affecting various physiological processes in living organisms.
Melatonin
A hormone produced by the pineal gland that regulates sleep and wakefulness.
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