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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.
These myoclonic twitches, jerks, or seizures are usually caused by sudden muscle contractions (positive myoclonus) or brief lapses of contraction (negative myoclonus). The most common circumstance under which they occur is while falling asleep (hypnic jerk). Myoclonic jerks occur in healthy people and are experienced occasionally by everyone.
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Muscle movements during REM sleep are often twitches and occur simultaneously with normal sleep. The position of the body during sleep may determine which motor symptom is displayed. For example, Anderson et al. reported that one individual showed entire body rolling movements while sleeping on his side while displaying head rolling movements ...
People with insomnia can have frequent difficulty falling asleep, staying asleep, and getting good-quality sleep. This results in feeling sleepy during the day, affecting your mood and ability to ...
In a perfect world, most of us should take 10 to 20 minutes to fall asleep, with the average sleep latency (the time it takes to fall asleep) sitting at about 12 minutes. But alas, this world is ...
Experiencing a hypnic jerk prior to falling asleep may have been selected so that the individual would be able to readjust their sleeping position in the tree with a branch-grabbing response to avoid falling, [4] much as orangutans grasp upper branches of trees while sleeping.
Whether it's the nightly news or an old Friends episode they've seen 40 times, many people say they are lulled to sleep by the television. In fact, some can’t imagine falling asleep without it ...