The circadian rhythm is an ____ clock found within all living ____ of life. The word circadian comes from Latin roots (circa + dies) and means around a day. This natural clock, which is the body’s sleep-wake cycle, ____ on a 24-hour period and regulates many ____ processes within our bodies. New-borns do not have a circadian rhythm and rely on an 18-hour sleep cycle that is divided into short ____ of a few hours. By the age of three months, most babies can sleep for about eight hours without waking during the night. Adolescents experience a ____ in their circadian rhythms because of ____ changes and influences. This disturbance results in ____ feeling sleepy a few hours later than usual.

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