sleep paralysis
A temporary inability to move or speak that occurs when falling asleep or waking up, often accompanied by hallucinations and feelings of fear.
Full Definition
A parasomnia characterized by the temporary loss of voluntary muscle control during the transition between sleep and wakefulness, typically lasting from seconds to minutes. During episodes, individuals remain conscious and aware of their surroundings but cannot move, speak, or open their eyes. Sleep paralysis often occurs alongside vivid and frightening hallucinations, creating intense feelings of fear and panic. The condition can occur in isolation or as part of other sleep disorders, particularly narcolepsy. Episodes are more common during REM sleep periods and can be triggered by stress, irregular sleep schedules, or sleep deprivation.
Usage
Usage note: Often occurs with other symptoms of narcolepsy but can be isolated.
In Context
- "The patient reported frequent episodes of sleep paralysis accompanied by visual hallucinations." — Sleep disorder evaluation
- "Sleep paralysis can be particularly distressing when combined with hypnagogic or hypnopompic hallucinations." — Clinical documentation