Hypnic jerk, also known as a hypnagogic jerk, is an involuntary twitching or jerking of the body that occurs just as a person is beginning to fall asleep. Despite the fact that hypnic jerks are usually harmless, there has been a rise in reports of this disorder in neurological illnesses such as Parkinsonism, migraine, and brainstem lesions, as well as in children with neurologic disorders. The International Classification of Sleep Disorders (ICSD-3) classified hypnic jerks as a sleep-related movement disorder as isolated symptoms. Although some people report a tingling or unpleasant sensation, hypnic jerks are often painless.Īccording to some specialists, hypnic jerks are a type of parasomnia – a sleep condition characterised by strange and undesired bodily events that disrupt your sleep. A person frequently reports falling, witnessing flashing or dazzling lights, the sound of slamming, crackling, or snapping. It may be accompanied by a feeling of falling or being startled.Īccording to the National Centre for Biotechnology Information, in addition to the jerking movement, a hypnic jerk is often accompanied by other sensations or mental imagery, such as a dream or hallucination. During a hypnic jerk, the person may experience a sudden, brief jolt of movement or sensation. They are thought to be caused by a sudden shift in brain activity as the body relaxes into a sleeping state. Hypnic jerks, also known as sleep starts, are involuntary twitches or muscle contractions that can occur during the transition from wakefulness to sleep.
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