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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. Myoclonus - Wikipedia

    en.wikipedia.org/wiki/Myoclonus

    The muscle jerks consist of symmetric, mostly generalized jerks, localized in the arms and in the shoulders and also simultaneously with a head nod; both the arms may fling out together and simultaneously a head nod may occur. Symptoms have some variability amongst subjects. Sometimes the entire body may jerk, just like a startle response.

  4. 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 ...

  5. Why You Sometimes Twitch Awake Right Before You Fall Asleep - AOL

    www.aol.com/news/why-twitch-awake-before-sleep...

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  6. Hypnagogia - Wikipedia

    en.wikipedia.org/wiki/Hypnagogia

    The word hypnagogia is sometimes used in a restricted sense to refer to the onset of sleep, and contrasted with hypnopompia, Frederic Myers's term for waking up. [2] However, hypnagogia is also regularly employed in a more general sense that covers both falling asleep and waking up.

  7. Doctors Say This Nighttime Behavior Can Be A Sign Of Dementia

    www.aol.com/lifestyle/doctors-nighttime-behavior...

    There are plenty of reason you might feel off in the late afternoon and evening. Maybe you’re mentally wiped after socializing all day, or your brain is fried from hours of work.

  8. This Nighttime Habit Could Be A Key Indicator Of Dementia ...

    www.aol.com/lifestyle/nighttime-habit-could-key...

    "The mechanisms that rid waste from the brain are far more active when we sleep." When you have healthy sleep, the glymphatic system in your brain—which pumps out waste products—is more active ...

  9. Microsleep - Wikipedia

    en.wikipedia.org/wiki/Microsleep

    Microsleep is extremely dangerous when it occurs in situations that demand constant alertness, such as driving a motor vehicle or working with heavy machinery. People who experience microsleeps often remain unaware of them, instead believing themselves to have been awake the whole time, or to have temporarily lost focus.