Q. Why are some of us “morning people” while others are naturally “night owls”?
A. All animals, including humans, experience daily ups and downs in physiological processes, such as body temperature and hormone secretion, as well as in behaviors such as sleeping and waking. Known as circadian rhythms, these patterns are governed by a core “clock” in our brains that’s primarily tuned to the 24-hour cycle of light and dark.
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