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  2. Cramp - Wikipedia

    en.wikipedia.org/wiki/Cramp

    Cramp. A cramp is a sudden, involuntary, painful skeletal muscle contraction [1][2] or overshortening associated with electrical activity; [3] while generally temporary and non-damaging, they can cause significant pain and a paralysis -like immobility of the affected muscle. A cramp usually goes away on its own over a period of several seconds ...

  3. Hypnic jerk - Wikipedia

    en.wikipedia.org/wiki/Hypnic_jerk

    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 ...

  4. Rhythmic movement disorder - Wikipedia

    en.wikipedia.org/wiki/Rhythmic_movement_disorder

    Rhythmic movement disorder. 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]

  5. How Your Painful Leg Cramps Could Be Signaling a Vitamin ...

    www.aol.com/painful-leg-cramps-could-signaling...

    The causes of leg cramps at night can range from nutrient deficiency to tough workouts. Here, experts break down how to prevent and get rid of leg cramps.

  6. Myoclonus - Wikipedia

    en.wikipedia.org/wiki/Myoclonus

    Myoclonus. Myoclonus is a brief, involuntary, irregular (lacking rhythm) twitching of a muscle, a joint, or a group of muscles, different from clonus, which is rhythmic or regular. Myoclonus (myo- "muscle", clonus "spasm") describes a medical sign and, generally, is not a diagnosis of a disease. It belongs to the hyperkinetic movement disorders ...

  7. Periodic limb movement disorder - Wikipedia

    en.wikipedia.org/wiki/Periodic_limb_movement...

    Periodic limb movement disorder (PLMD) is a sleep disorder where the patient moves limbs involuntarily and periodically during sleep, and has symptoms or problems related to the movement. PLMD should not be confused with restless legs syndrome (RLS), which is characterized by a voluntary response to an urge to move legs due to discomfort.

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