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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.
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.
Periodic limb movements in sleep (PLMS), sudden involuntary movement of the arms or legs during sleep. In the absence of other sleep disorders, PLMS may cause sleep disruption and impair sleep quality, leading to periodic limb movement disorder (PLMD). Other limb movements in sleep, including hypneic jerks and nocturnal myoclonus.
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.
Benign sleep myoclonus of infancy; Propriospinal myoclonus at sleep onset; Sleep-related movement disorder due to a medical disorder; Sleep-related movement disorder due to a medication or substance; Sleep-related movement disorder, unspecified; Isolated symptoms and normal variants Excessive fragmentary myoclonus
Sleep apnea is a serious medical condition that causes interruptions in your sleep leading to a wide range of symptoms. Learn more about the condition and how to get diagnosed.
Benign neonatal sleep myoclonus (BNSM) is the occurrence of myoclonus (jerky movements) during sleep. [1] It is not associated with seizures. [1] BNSM occurs in the first few weeks of life, and usually resolves on its own within the first 3-4 months of life. [2]
The three main signs of hyperekplexia are generalized stiffness, excessive startle response beginning at birth, and nocturnal myoclonus. [5] Affected individuals are fully conscious during episodes of stiffness, which consist of forced closure of the eyes and an extension of the extremities followed by a period of generalised stiffness and uncontrolled falling at times. [6]