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Sleep is a state when our senses and motor activity are relatively suspended; there is total or partial unconsciousness, and all voluntary muscles are inactive. Sleep is more reversible than hibernation or coma, but responds less to stimuli than quiet wakefulness. Sleep is the body's rest cycle.
Sleep is a heightened anabolic state - a period when our bodies are producing new bone, muscular and nervous tissue; a period when growth and repairs occur.
Most animals sleep, including mammals (humans are mammals), birds, a significant number of reptiles, amphibians, and fish.
A complex group of hormones trigger sleep. These hormones respond to cues within our body, as well as in the environment. Approximately 80% of sleep time is without dreams, this period of mainly dreamless sleep is known as NREM (non-rapid eye movement). Dreams occur mainly during REM (rapid eye movement).
tags: sleep, dream, bed, rest, relaxing, nap, lazy