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Hypnagogic Hallucinations and Sleep Paralysis
Hypnagogic Hallucinations and Sleep Paralysis Hypnagogic hallucinations are brief periods of dreaming between the stages of sleep and consciousness. These dreams can be frightening and can often cause a sudden jerk and arousal just before sleep onset. For example, you may see yourself falling and then, just before impact, awaken with a sudden jerk.
Sleep paralysis is the sensation of feeling paralyzed upon awakening, usually immediately following a dream. This is commonly associated with the loss of muscle tone during dreams, called atonia. This loss of muscle tone during the dreaming stage prevents one from acting out his or her dreams. Hypnagogic hallucinations and sleep paralysis can occur together. Although commonly seen in people with narcolepsy, they can also affect others, especially those individuals who are sleep-deprived. While they can be frightening, these events are not physically dangerous and usually last only a few minutes.
REM Behavior Disorder
REM Behavior Disorder is the ability to act out your dreams. The obvious problem with acting out your dreams is the potential to cause injury. All body muscles, with the exception of those used in breathing, are usually paralyzed during REM (dreaming) sleep. In some cases this paralysis is incomplete or absent, thus allowing dreams to be acted out. Behavior such as this can be violent and result in serious injuries to the victim and bed-partner. After awakening the sleeper will usually be able to recall vivid dreaming.