Information about Hypnic Jerk
A hypnic or hypnagogic jerk is an involuntary muscle twitch (commonly known as a myoclonic twitch) which occurs during the transition into hypnagogia.
It is often described as an electric shock or falling sensation, and can cause movement of the body in bed. Hypnic jerks are experienced by most people, especially when exhausted or sleeping uncomfortably.
When a subject is deprived of sleep and is trying to fight sleep, hypnic jerks can occur more often. This normally happens to subjects who have deprived themselves of sleep for longer than 24 hours, or to those who have recently woken up from insufficient amounts of sleep.
Occurrence
Hypnic jerks are usually felt once or twice per night. More regular, and usually less intense, hypnic jerks often occur during normal sleep. In extreme cases, this may be classified as a disorder called periodic limb movement. The person with the disorder will usually sleep through the events.When a subject is deprived of sleep and is trying to fight sleep, hypnic jerks can occur more often. This normally happens to subjects who have deprived themselves of sleep for longer than 24 hours, or to those who have recently woken up from insufficient amounts of sleep.
See also
External links
MeSH D009207 Myoclonus (IPA: /ˌmɑɪ̯ˈɑk.lə.nəs/) is brief, involuntary twitching of a muscle or a group of muscles.
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Hypnagogia (also spelled hypnogogia) describes vivid dreamlike auditory, visual, or tactile sensations, which are often accompanied by sleep paralysis and experienced when falling asleep or waking up.
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An electric shock can occur upon contact of a human's body with any source of voltage high enough to cause sufficient current flow through the muscles or hair. The minimum current a human can feel is thought to be about 1 milliampere (mA).
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Periodic Limb Movement Disorder (PLMD), also called nocturnal myoclonus, is a sleep disorder where the patient moves limbs involuntarily during sleep and has symptoms or problems related to the movement.
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Muscle spasm
Classifications and external resources
ICD-10 R 25.2
ICD-9 728.85
A spasm is a sudden, involuntary contraction of a muscle, a group of muscles, or a hollow organ, or a similarly sudden contraction of an orifice.
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Classifications and external resources
ICD-10 R 25.2
ICD-9 728.85
A spasm is a sudden, involuntary contraction of a muscle, a group of muscles, or a hollow organ, or a similarly sudden contraction of an orifice.
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A muscle contraction (also known as a muscle twitch or simply twitch) occurs when a muscle fiber generates tension through the action of actin and myosin cross-bridge cycling. While under tension, the muscle may lengthen, shorten or remain the same.
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Restless legs syndrome
Classification & external resources
Sleep pattern of a Restless Legs Syndrome patient (red) vs. a healthy sleep pattern (blue).
ICD-10 G 25.8
ICD-9 333.
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Classification & external resources
Sleep pattern of a Restless Legs Syndrome patient (red) vs. a healthy sleep pattern (blue).
ICD-10 G 25.8
ICD-9 333.
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Hypnagogia (also spelled hypnogogia) describes vivid dreamlike auditory, visual, or tactile sensations, which are often accompanied by sleep paralysis and experienced when falling asleep or waking up.
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Exploding head syndrome is a condition first reported by a British physician in 1988[1] that causes the sufferer to occasionally experience a tremendously loud noise as if from within his or her own head, usually described as an explosion, roar or a ringing noise.
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MeSH D009207 Myoclonus (IPA: /ˌmɑɪ̯ˈɑk.lə.nəs/) is brief, involuntary twitching of a muscle or a group of muscles.
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Sleep is the state of natural rest observed throughout the animal kingdom, in all mammals and birds, and in many reptiles, amphibians, and fish.
In humans, other mammals, and many other animals that have been studied — such as fish, birds, ants, and fruit-flies —
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In humans, other mammals, and many other animals that have been studied — such as fish, birds, ants, and fruit-flies —
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