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  2. 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.

  3. Tremor - Wikipedia

    en.wikipedia.org/wiki/Tremor

    A tremor is an involuntary, [1] somewhat rhythmic muscle contraction and relaxation involving oscillations or twitching movements of one or more body parts. It is the most common of all involuntary movements and can affect the hands, arms, eyes, face, head, vocal folds, trunk, and legs.

  4. Convulsion - Wikipedia

    en.wikipedia.org/wiki/Convulsion

    A person having a convulsion may experience several different symptoms, [1] such as a brief blackout, confusion, drooling, loss of bowel or bladder control, sudden shaking of the entire body, uncontrollable muscle spasms, or temporary cessation of breathing. [1] Symptoms usually last from a few seconds to several minutes, although they can last ...

  5. Essential tremor - Wikipedia

    en.wikipedia.org/wiki/Essential_tremor

    Essential tremor (ET), also called benign tremor, familial tremor, and idiopathic tremor, is a medical condition characterized by involuntary rhythmic contractions and relaxations (oscillations or twitching movements) of certain muscle groups in one or more body parts of unknown cause. [6]

  6. Falling (sensation) - Wikipedia

    en.wikipedia.org/wiki/Falling_(sensation)

    Hypnic jerk, also called hypnagogic jerk, is a normal reaction that can be caused by anxiety, caffeine, a dream, or discomfort of sleeping. A hypnic jerk is the feeling triggered by a sudden muscle twitch, causing the feeling of falling while sleeping or dreaming. Hypnic jerks typically occur moments before the first stage of sleep. [2]

  7. An alarming number of adults in the U.S. are at risk of heart ...

    www.aol.com/news/surprisingly-high-number-adults...

    Nearly 90% of adults over age 20 in the United States are at risk of developing heart disease, an alarming new study suggests.. While the unexpectedly high number doesn't mean that the majority of ...

  8. Why Has My Dog's Behavior Suddenly Changed? An Expert ... - AOL

    www.aol.com/why-dogs-behavior-suddenly-changed...

    I'm not sure why, and am hoping you can help. After he was neutered, I didn't notice any sudden changes in personality or behavior, except that he found his appetite. Before then, he was always a ...

  9. Panic disorder - Wikipedia

    en.wikipedia.org/wiki/Panic_disorder

    Panic disorder is a mental and behavioral disorder, [5] specifically an anxiety disorder characterized by reoccurring unexpected panic attacks. [1] Panic attacks are sudden periods of intense fear that may include palpitations, sweating, shaking, shortness of breath, numbness, or a feeling that something terrible is going to happen.