Sleep

Sleep is the regular state of natural unconsciousness observed in all mammals, birds and fish. It is heavily influenced by circadian rhythms, and by hormonal and environmental factors as well. Sleep appears to perform a restorative function for the brain and body, as evidenced by the myriad symptoms that result when an individual is deprived of sleep. Its function in health and in disease is being increasingly studied in specialized sleep laboratories throughout the world.

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Unconsciousness: Unconsciousness is the absence of consciousness. Unconsciousness normally only occurs during sleep, and even then dreaming may involve partial or full consciousness of dream events. Unconsciousness may also occur from a concussion, during an epileptic seizure, as a result of intoxication, or due to ...

Fish: : This page is about the animals. For other meanings, please see Fish (disambiguation)....

Circadian rhythm: Circadian rhythm is the name given to the roughly 24 hour cycles shown by physiological processes in plants and animals. (The term circadian comes from the Latin circa, meaning "around" and dies, "day", meaning literally, "around a day.") It was initially discovered in the movement of plant leaves i...

Sleep related Images and Photos (experimental)

Sleep c.1873	Big Sleep, The (DVD)	Black Sleep, The	Beauty Sleep
Shallow Sleep	30 Sleep-Sheep	Eat Sleep Go Fishing	Goodnight Sleep Trainer
Strays Don't Sleep: Strays Don't Sleep	Strays Don't Sleep: Strays Don't Sleep	The Big Sleep 1946	Groclock - Sleep Trainer For Kids