According to Dr. David Seiden, Medical Director of the Pembroke Pines Sleep Center with Baptist Health South Florida, people have different circadian rhythms, which are genetically programmed. "Some of us are night owls, some of us are larks."

He explains a normal sleeper sleeps at night, in the afternoon will have the best coordination, and will achieve the deepest sleep at about 1 or 2 a.m.

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