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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.
Myoclonus is a brief, involuntary, irregular (lacking rhythm) twitching of a muscle, a joint, or a group of muscles, different from clonus, which is rhythmic or regular.. Myoclonus (myo-"muscle", clonus "spasm") describes a medical sign and, generally, is not a diagnosis of a dis
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.
A sensation of falling occurs when the labyrinth or vestibular apparatus, a system of fluid-filled passages in the inner ear, detects changes in acceleration. This sensation can occur when a person begins to fall, which in terms of mechanics amounts to a sudden acceleration increase from zero to roughly 9.81 m/s 2 .
If you fall asleep on one arm, this can reduce circulation or cause numbness. Sleeping on one side with the face pressed into a pillow can also cause temporary lines or marks in the skin .
In such, patients come short of full rhythmic movements that they experience in sleep. Such behavioral training has been shown to carry over into sleep, and the forcefulness of the RMD movements is reduced or eliminated. [2] Hypnosis and sleep restriction have been used in some cases to good effect. [18]
This can manifest as waking up multiple times during the night or waking up once and struggling to fall back asleep. As Mathis explains, this type of insomnia disrupts the continuity of sleep ...
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 ...