What Can Cause Frequent Sleep Disorder And Loss Of Appetite?

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Sleep Disorders vary in nature and degree. The three major sleep disorders are dyssomnias (insomnia), hypersomnia (disorders of excessive sleepiness) and parasomnias (abnormal behaviors during sleep).

Sleep consists of two distinct states: REM (rapid eye movement) sleep and NREM (non-REM) sleep. Dreaming occurs mostly in REM sleep.

Sleep is a cyclic phenomenon, with four or five REM periods during the night, which accounts for about 25 percent of the total night’s sleep.

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