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Definition of Sleep Paralysis

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Updated February 19, 2014

Definition:

It is characterized by a temporary inability to move while transitioning from sleep to wakefulness, such as when falling asleep or waking up. It may be frightening as one may seem to be awake, but unable to move. It is common, but may also be a symptom of narcolepsy. It is sometimes referred to as the "old hag".

Examples:
It terrifies me when I have sleep paralysis, but I understand that it may be a normal phenomenon.
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