Is more easily reversed than the state of hibernation or of being comatose, though sleep is a naturally recurring state of mind characterized by altered consciousness, relatively inhibited sensory activity, inhibition of nearly all voluntary muscles, and reduced interactions with surroundings.[1] It is distinguished from wakefulness by a decreased ability to react to stimuli. Mammalian rest occurs in repeating times, when the body alternates in between two highly specific methods called non-REM and REM sleep. REM represents "quick eyesight movement" but involves all kinds of other features which include digital paralysis of the body. Sleep