Hypnic jerk

kickyou get that falling sensation
A hypnic jerk 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.wikipedia
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Myoclonus

myoclonicmyoclonic jerkmyoclonic jerks
Hypnic jerks are one form of involuntary muscle twitches called myoclonus.
The most common circumstance under which they occur is while falling asleep (hypnic jerk).

Falling (sensation)

falling sensationsensation of falling
Physically, hypnic jerks resemble the "jump" experienced by a person when startled, sometimes accompanied by a falling sensation.
In the early stages of sleep, a falling sensation may be perceived in connection with a hypnic jerk, sometimes awaking the sleeper abruptly.

Muscle contraction

contractionmuscular contractionexcitation-contraction coupling
A hypnic jerk 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.

Non-rapid eye movement sleep

NREMNREM sleepnon-REM sleep
According to a study on sleep disturbances in the Journal of Neural Transmission, a hypnic jerk occurs during the non-rapid eye movement sleep cycle and is an "abrupt muscle action flexing movement, generalized or partial and asymmetric, which may cause arousal, with an illusion of falling".

Periodic limb movement disorder

periodic limb movements in sleeplimb twitching during sleepnocturnal myoclonus
For example, hypnic jerks can be confused with restless leg syndrome, periodic limb movement disorder, hypnagogic foot tremor, rhythmic movement disorder, and hereditary or essential startle syndrome, including the hyperplexia syndrome.
* Hypnic jerk

Hypnagogia

hypnagogichypnagogic hallucinationhypnagogic hallucinations
Perhaps the most common experience of this kind is the falling sensation, and associated hypnic jerk, encountered by many people, at least occasionally, while drifting off to sleep.

Sequela

sequelaepost-viral syndromeproblems
Their course is benign and do not cause any neurological sequelae.

American Academy of Sleep Medicine

According to the American Academy of Sleep Medicine there is a wide range of potential causes, including anxiety, stimulants like caffeine and nicotine, stress and strenuous activities in the evening.

Anxiety

anxiousnervousnessanxieties
According to the American Academy of Sleep Medicine there is a wide range of potential causes, including anxiety, stimulants like caffeine and nicotine, stress and strenuous activities in the evening.

Restless legs syndrome

restless leg syndromerestless legsrestless legs syndrome (RLS)
For example, hypnic jerks can be confused with restless leg syndrome, periodic limb movement disorder, hypnagogic foot tremor, rhythmic movement disorder, and hereditary or essential startle syndrome, including the hyperplexia syndrome.

Rhythmic movement disorder

For example, hypnic jerks can be confused with restless leg syndrome, periodic limb movement disorder, hypnagogic foot tremor, rhythmic movement disorder, and hereditary or essential startle syndrome, including the hyperplexia syndrome.

Hyperekplexia

hereditary or essential startle syndrome
For example, hypnic jerks can be confused with restless leg syndrome, periodic limb movement disorder, hypnagogic foot tremor, rhythmic movement disorder, and hereditary or essential startle syndrome, including the hyperplexia syndrome.

Hypothesis

hypotheseshypotheticalhypothesized
One hypothesis posits that the hypnic jerk is a form of reflex, initiated in response to normal bodily events during the lead-up to the first stages of sleep, including a decrease in blood pressure and the relaxation of muscle tissue.

Reflex

reflexesreflex actioninvoluntary action
One hypothesis posits that the hypnic jerk is a form of reflex, initiated in response to normal bodily events during the lead-up to the first stages of sleep, including a decrease in blood pressure and the relaxation of muscle tissue.

Epilepsy

epilepticseizure disorderepilepsies
During an epilepsy and intensive care study, the lack of a preceding spike discharge measured on an epilepsy monitoring unit, along with the presence only at sleep onset, helped differentiate hypnic jerks from epileptic myoclonus.

Intensive care medicine

intensive carecritical carecritical care medicine
During an epilepsy and intensive care study, the lack of a preceding spike discharge measured on an epilepsy monitoring unit, along with the presence only at sleep onset, helped differentiate hypnic jerks from epileptic myoclonus.

Positive feedback

positive feedback looppositiveexacerbated
This increased anxiety and fatigue increases the likelihood of experiencing these jerks, resulting in a positive feedback loop.

Inception

film of the same nameDom KolbDominick Cobb
At each dream level, the person generating the dream stays behind to set up a "kick" that will be used to awaken the other sleeping team members from the deeper dream level; to be successful, these kicks must occur simultaneously at each dream level, a fact complicated due to the nature of time which flows much faster in each successive level.

Sleep disorder

sleep disorderssleep disturbancesleep disturbances

Get Out

(''Get Out
"I always had this concept of the place that you’re falling toward when you’re going to sleep, and you get that falling sensation and catch yourself. And if you didn’t catch yourself, where would you end up? I had this hellish image, and I thought of this idea of, 'What if you were in a place, and you could look through your own eyes as if they were literal windows or a screen, and see what your body was seeing, but feel like a prisoner in your own mind—the chamber of your mind?'" Peele explained.

Vestigial response

vestigial reflex
In humans, vestigial responses include ear perking, goose bumps and the hypnic jerk.