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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.
Although there may be certain triggers, ultimately sleep paralysis is believed to be a problem with the regulation of REM. During this phase of sleep, the body is kept relaxed so that dreams are not acted out. If this relaxation, or atonia, occurs while the person is awake, it can cause temporary paralysis. This may be experienced when a REM period is disrupted.