What is sleep?
All living things require sleep. It is the natural state of rest observed not only by human beings but also by other species of the animal kingdom. An adequate amount of sleep is important for one's health and survival. It is during sleep that the body is recharged for another day of work.
Sleep has five stages. The first four stages are part of the non-rapid eye movement (non-REM) phase of sleep. The last stage is the rapid eye movement (REM) sleep. Stage one is the transitio
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