Another way to look at it is by taking the circadian rhythm and extrapolating it into our ultradian rhythms, which are the rhythms that move with us through the twenty-four-hour cycle of our lives. Sleep researcher Neil Kleitman identified the presence and importance of rapid eye movement (REM) sleep and discovered that the body generally operates in ninety-minute cycles, moving progressively through periods of higher and lower alertness.

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Peter Hollins is a bestselling author, human psychology researcher, and a dedicated student of the human condition.

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