Post-Traumatic Stress Disorder (PTSD) is a condition of persistent mental and emotional stress occurring as a result of injury or severe psychological shock, typically involving disturbance of sleep and constant vivid recall of the experience, with dulled responses to others and to the outside world.
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Diagnostic Criteria for Narcolepsy (DSM-IV-TR)
Narcolepsy is characterized by permanent, overwhelming feelings of sleepiness and fatigue. Other symptoms include abnormalities of dreaming sleep, such as dream-like hallucinations and feeling physically weak or paralyzed for a few seconds.