Child Health
Sleep Disorders
Health
Human Anatomy and Physiology

Sleep and Circadian Rhythm

Sleep is an innate human need, which typically occurs for several hours at one time or more than one time during a circadian rhythm. Sleep varies from a few hours to over 8 hours, with babies and children requiring the most sleep. During sleep, the eyes close, muscles relax, nervous system reduces, and the body enters a different consciousness. Many health conditions and environmental factors can interrupt both sleep and awakening.

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