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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.
The muscle jerks consist of symmetric, mostly generalized jerks, localized in the arms and in the shoulders and also simultaneously with a head nod; both the arms may fling out together and simultaneously a head nod may occur. Symptoms have some variability amongst subjects. Sometimes the entire body may jerk, just like a startle response.
A hypnic jerk is the feeling triggered by a sudden muscle twitch, causing the feeling of falling while sleeping or dreaming. Hypnic jerks typically occur moments before the first stage of sleep. [2] About 70% of people have experienced hypnic jerk. [3] Hypnic jerks are most common in children, when dreams are considered the most simple. [4]
Here, experts explain why your head feels heavy. Plus, learn the causes for why your head might feel heavy, treatment options, and when to see a doctor.
An earworm happens when you have the “inability to dislodge a song and prevent it from repeating itself” in your head, explains Steven Gordon, M.D., neurotologist at UC Health and assistant ...
As you head into the holiday season, you’re likely spending more time than usual with older loved ones. With that, it’s worth it for any adult to better understand how sundowning presents, and ...
Sexual headache is a type of headache that occurs in the skull and neck during sexual activity, including masturbation or orgasm.These headaches are usually benign, but occasionally are caused by intracranial hemorrhage and cerebral infarction, especially if the pain is sudden and severe. [1]
Rhythmic movement disorder (RMD) is a neurological disorder characterized by repetitive movements of large muscle groups immediately before and during sleep often involving the head and neck. It was independently described first in 1905 by Zappert as jactatio capitis nocturna and by Cruchet as rhythmie du sommeil . [ 1 ]
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