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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 word hypnagogia is sometimes used in a restricted sense to refer to the onset of sleep, and contrasted with hypnopompia, Frederic Myers's term for waking up. [2] However, hypnagogia is also regularly employed in a more general sense that covers both falling asleep and waking up.
Recurrent isolated sleep paralysis is an inability to perform voluntary movements at sleep onset, or upon waking from sleep. [22] Although the affected individual is conscious and recall is present, the person is not able to speak or move. However, respiration remains unimpaired. [22] The episodes last seconds to minutes and diminish ...
Essential tremor (ET), also called benign tremor, familial tremor, and idiopathic tremor, is a medical condition characterized by involuntary rhythmic contractions and relaxations (oscillations or twitching movements) of certain muscle groups in one or more body parts of unknown cause. [6]
Many affected individuals also have other sleep related disorders, like sleep apnea. The disorder can be differentially diagnosed into small subcategories, including sleep related bruxism, thumb sucking, hypnagogic foot tremor, and rhythmic sucking, to name a few. [2]
You may have difficulty falling asleep or you may wake up in the middle of the night and be unable to get back to sleep. You may be feeling tired and exhausted.
Tremor can also be caused by lack of sleep, lack of vitamins, or increased stress. [11] [12] Deficiencies of magnesium and thiamine [13] have also been known to cause tremor or shaking, which resolves when the deficiency is corrected. [14] Tremors in animals can also be caused by some spider bites, e.g. the redback spider of Australia. [15]
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