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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. Hypnic jerks are one form of involuntary muscle twitches ...
Paresthesia is an abnormal sensation of the skin (tingling, pricking, chilling, burning, numbness) with no apparent physical cause. [1] Paresthesia may be transient or chronic, and may have many possible underlying causes. [1] Paresthesias are usually painless and can occur anywhere on the body, but most commonly occur in the arms and legs.
Sleepwalking is a sleep disorder, or parasomnia, that happens during the deep part of nonrapid eye movement (NREM) sleep — usually within a couple of hours after falling asleep. Nearly 7% of ...
Sleep disorder. A sleep disorder, or somnipathy, is a medical disorder of an individual's sleep patterns. Some sleep disorders are severe enough to interfere with normal physical, mental, social and emotional functioning. Sleep disorders are frequent and can have serious consequences on patients' health and quality of life. [1]
In some instances, people may worry about being able to fall asleep, which in turn can make it harder to sleep," says Alert. Medications: Certain medications can cause insomnia as a side effect ...
Hypnagogia is the transitional state from wakefulness to sleep, also defined as the waning state of consciousness during the onset of sleep. Its opposite state is described as hypnopompia – the transitional state from sleep into wakefulness. Mental phenomena that may occur during this "threshold consciousness" phase include hypnagogic ...
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Sleep paralysis. The Nightmare by Swiss artist Henry Fuseli (1781) is thought to be a depiction of sleep paralysis perceived as a demonic visitation. Sleep paralysis is a state, during waking up or falling asleep, in which a person is conscious but in a complete state of full-body paralysis. [1][2] During an episode, the person may hallucinate ...