Why do people twitch when falling asleep?

Many people notice that at the moment when the body relaxes and consciousness begins to sink into sleep, there is a sharp jerking movement. This sensation is similar to falling or an unexpected movement, after which a person may even wake up for a second. This phenomenon is called hypnic jerk.

It occurs because the nervous system works particularly actively during the transition to sleep. Muscles gradually relax, breathing slows down, pulse becomes less frequent. The brain perceives this as a signal of possible danger and seems to check if everything is in order. In response to this "control," the body may suddenly jerk.

It is believed that hypnic jerks were inherited by humans from ancient ancestors. In those times, sleeping in trees or in the wild was unsafe, and such impulses helped to wake up in time if the body lost a stable position.

Most often, jerking appears in people who experience stress, fatigue, or drink a lot of caffeine. Sleep deprivation also increases the likelihood of such movements. In most cases, they do not pose a threat to health and are a normal reaction of the body.

If the jerks become too frequent, interfere with sleep, or are accompanied by other unpleasant sensations, it's worth consulting a doctor. Sometimes this may be associated with nervous system disorders or deficiencies of certain microelements.

Thus, night twitches are a natural protective reaction that under normal conditions should not cause concern.