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Hypnic jerk

BarnacleBob

Exoriare aliquis nostris ex ossibus ultor
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Hypnic jerk:

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. Hypnic jerks are one form of involuntary muscle twitches called myoclonus. Physically, hypnic jerks resemble the "jump" experienced by a person when startled, sometimes accompanied by a falling sensation. Hypnic jerks are associated with a rapid heartbeat, quickened breathing, sweat, and sometimes "a peculiar sensory feeling of 'shock' or 'falling into the void'". It can also be accompanied by a vivid dream experience or hallucination. A higher occurrence is reported in people with irregular sleep schedules. Men have also been known to experience this at a higher rate than women. Moreover, when particularly frequent and severe, hypnic jerks have been reported as a cause of sleep-onset insomnia.Wikipedia
 

Son of Gloin

Certainty of death? What are we waiting for?
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Yeah, that’s happened to me. I didn’t know it had a name.
 

hammerhead

Morphing
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That excuse has been used for me being hit while laying next to someone. I never believed it.