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Sleep paralysis poses no immediate risk to those who experience it, and it lasts from several seconds to several minutes. Genetics and sleep deprivation are a major cause of sleep paralysis, and it has also been linked to disorders such as narcolepsy, migraines, stress, anxiety disorders, and obstructive sleep apnea. Sleeping in a fixed supine position increases the chance of sleep paralysis.
Sleep scientists believe that sleep paralysis may occur when the transitions in and out of REM sleep and other sleep stages don't go smoothly. The paralysis that is typically confined to REM sleep spills over to other sleep stages -- and if you wake, you become aware of your body's paralysis, and the frightening feeling of being unable to move or to speak.