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Individuals with exploding head syndrome hear or experience loud imagined noises as they are falling asleep or are waking up, have a strong, often frightened emotional reaction to the sound, and do not report significant pain; around 10% of people also experience visual disturbances like perceiving visual static, lightning, or flashes of light.
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.
Brain zaps happen suddenly and last for a few seconds, but the actual feeling varies depending on the person. “People say it feels like a shock that’s not painful, but feels different than a ...
Sensory and movement disturbances have also been reported, including imbalance, tremors, vertigo, dizziness, and electric-shock-like experiences in the brain, often described by people who have them as brain zaps. These "brain zaps" have been described as an electric shock felt in the skull, potentially triggered by lateral eye movement, and at ...
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For example, Robert Stickgold recounts having experienced the touch of rocks while falling asleep after mountain climbing. [6] This can also occur to people who have travelled on a small boat in rough seas or have been swimming through waves, shortly before going to bed, and they feel the waves as they drift to sleep, or people who have spent ...
[3] [2] As an example of pseudohallucinations, Kandinsky cited hypnagogic hallucinations that occur in healthy individuals just before falling asleep. [4] Karl Jaspers further developed Kandinsky's ideas, emphasizing the "inner subjective space" as the locus of these experiences, where vivid sensory images occurred spontaneously but were devoid ...
Rhythmic movement disorder (RMD) is a neurological disorder characterized by repetitive movements of large muscle groups immediately before and during sleep often involving the head and neck. It was independently described first in 1905 by Zappert as jactatio capitis nocturna and by Cruchet as rhythmie du sommeil . [ 1 ]