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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 ).
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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 ...
Onset insomnia is characterized by difficulty falling asleep at night, leaving people tossing and turning for hours. Maintenance insomnia involves the inability to stay asleep throughout the night.
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.
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 ...