Narcolepsy  Narcolepsy is the habit of falling asleep very quickly at inappropriate times. It is possible that narcolepsy has a genetic cause.
People with narcolepsy commonly experience a condition known as terrifying hypnagogic hallucinations. These hallucinations are common in people with narcolepsy because thsese people regularly go into REM sleep right after falling asleep.This condition is an intrinsic sleep disorder, meaning that it comes from within the body. It is a type of dyssomnia. | 
