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You can't wait to go to your sister's wedding and see family and friends. But you're not so thrilled at the idea of the long cross-country flight from California to North Carolina. You feel fine for a while after you get there. But later that night, you have trouble sleeping, even though you're tired. And your stomach...
What is the body clock? The body's "biological clock," or 24-hour cycle ( circadian rhythm), can be affected by light or darkness, which can make the body think it is time to sleep or wake up. The 24-hour body clock controls functions such as: Sleeping and waking. Body temperature. The body's...