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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. Symphysis pubis dysfunction - Wikipedia

    en.wikipedia.org/wiki/Symphysis_pubis_dysfunction

    The main symptom is usually pain or discomfort in the pelvic region, usually centered on the joint at the front of the pelvis (the pubic symphysis). Some sufferers report being able to hear and feel the pubic symphysis and/or sacroiliac, clicking or popping in and out as they walk or change position. Sufferers frequently also experience pain in ...

  4. Is cracking your joints a harmful habit? Here’s what the ...

    www.aol.com/lifestyle/cracking-joints-harmful...

    The joints may also make sounds because of damage to or irregularity in the joint surface or internal structure of the joint, says Lawrie. People with arthritis usually experience this type of ...

  5. Rhythmic movement disorder - Wikipedia

    en.wikipedia.org/wiki/Rhythmic_movement_disorder

    body rocking, where the whole body is moved while on the hands and knees. head banging, where the head is forcibly moved in a back and forth direction. head rolling, where the head is moved laterally while in a supine position. Other less common muscle movements include: body rolling, where the whole body is moved laterally while in a supine ...

  6. What makes joints pop and crack and is it a sign of ... - AOL

    www.aol.com/news/makes-joints-pop-crack-sign...

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  7. Joint cracking - Wikipedia

    en.wikipedia.org/wiki/Joint_cracking

    Joint cracking is the manipulation of joints to produce a sound and related "popping" sensation. It is sometimes performed by physical therapists, chiropractors, and osteopaths [1] pursuing a variety of outcomes. The cracking of joints, especially knuckles, was long believed to lead to arthritis and other joint problems. However, this is not ...

  8. Nocturnal emission - Wikipedia

    en.wikipedia.org/wiki/Nocturnal_emission

    Due to the difficulty in collecting ejaculate produced during nocturnal emissions, relatively few studies have examined its composition. [4] [5]In the largest study, which included nocturnal emission samples from 10 men with idiopathic anejaculation, the semen concentration was equivalent to samples obtained from the same men by penile vibratory stimulation, although the proportions of sperm ...

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