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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.
Sleep myoclonus occurs during the initial phases of sleep, especially at the moment of dropping off to sleep, and include familiar examples of myoclonus such as the hypnic jerk. Some forms appear to be stimulus-sensitive. Some people with sleep myoclonus are rarely troubled by it, or need treatment.
body rocking, where the whole body is moved while on the hands and knees. head banging, where the head is forcibly moved in a back and forth direction. head rolling, where the head is moved laterally while in a supine position. Other less common muscle movements include: body rolling, where the whole body is moved laterally while in a supine ...
Periodic limb movement disorder (PLMD) is a sleep disorder where the patient moves limbs involuntarily and periodically during sleep, and has symptoms or problems related to the movement. PLMD should not be confused with restless legs syndrome (RLS), which is characterized by a voluntary response to an urge to move legs due to discomfort.
Sleep disruption may leave people with RLS sleepy during the day, with low energy, and irritable or depressed. [2] Additionally, many have limb twitching during sleep, a condition known as periodic limb movement disorder. [11] RLS is not the same as habitual foot-tapping or leg-rocking. [12]
While it's more common in kids, with reported rates of 5% experiencing an episode within the previous year, as many as 1.5% of adults also report walking in their sleep each year.