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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.
Symptoms of rhythmic movement disorder vary, but most share common large muscle movement patterns. Many show consistent symptoms including: [citation needed] body rocking, where the whole body is moved while on the hands and knees.
“This change in the body can cause shaking or chills, among other things.” ... One of those things it activates is the sympathetic nervous system, resulting in symptoms like chills, sweating ...
A tremor is an involuntary, [1] somewhat rhythmic muscle contraction and relaxation involving oscillations or twitching movements of one or more body parts. It is the most common of all involuntary movements and can affect the hands, arms, eyes, face, head, vocal folds, trunk, and legs.
Piloerection (goose bumps), the physical part of frisson. Frisson (UK: / ˈ f r iː s ɒ n / FREE-son, US: / f r iː ˈ s oʊ n / free-SOHN [1] [2] French:; French for "shiver"), also known as aesthetic chills or psychogenic shivers, is a psychophysiological response to rewarding stimuli (including music, films, stories, people, photos, and rituals [3]) that often induces a pleasurable or ...
Intention tremor is a dyskinetic disorder characterized by a broad, coarse, and low-frequency (below 5 Hz) tremor evident during deliberate and visually-guided movement (hence the name intention tremor).
Paroxysmal sympathetic hyperactivity (PSH) is a syndrome that causes episodes of increased activity of the sympathetic nervous system.Hyperactivity of the sympathetic nervous system can manifest as increased heart rate, increased respiration, increased blood pressure, diaphoresis, and hyperthermia. [1]
She explains that Abby’s shake-offs in the video were around two minutes ago, and we can look at the rest of her body language to work out why she was shaking off.