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A hypnic jerk, hypnagogic jerk, sleep start, sleep twitch, myoclonic jerk, or night start is a brief and sudden involuntary contraction of the muscles of the body which occurs when a person is beginning to fall asleep, often causing the person to jump and awaken suddenly for a moment.
The word hypnagogia is sometimes used in a restricted sense to refer to the onset of sleep, and contrasted with hypnopompia, Frederic Myers's term for waking up. [2] However, hypnagogia is also regularly employed in a more general sense that covers both falling asleep and waking up.
The first version of this article was adapted from the public domain NINDS Myoclonus Information Page Archived 2008-12-03 at the Wayback Machine. "Why do we twitch while falling asleep?" (The Straight Dope) Myoclonus Fact Sheet Archived 2016-12-03 at the Wayback Machine, National Institute of Neurological Disorders and Stroke (viewed 5 Apr 2005)
A hypnic jerk is the feeling triggered by a sudden muscle twitch, causing the feeling of falling while sleeping or dreaming. Hypnic jerks typically occur moments before the first stage of sleep. [2] About 70% of people have experienced hypnic jerk. [3] Hypnic jerks are most common in children, when dreams are considered the most simple. [4]
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Many find that their sleep is not refreshing and are tired or stressed the following day, despite getting a full nights rest. However, other patients report that their sleep patterns are infrequently interrupted due to RMD episodes and do not report being excessively sleepy during the next day as scored on the Epworth Sleepiness Scale . [ 4 ]
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