What cause sleep effects and sleep disorders?

There are a variety of sleep disorders that cause fatigue, including insomnia, hypersomnia, sleep apnea , and restless legs syndrome.

Stress. Food additives. Food allergies.

In people prone to sleep walking, sleep disturbance, including sleep deprivation, can make sleep walking more likely.

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Necrophilia.means sexual intercourse with a dead person!The word you want is Narcolepsy: a condition characterized by an extreme tendency to fall asleep.