A hypnagogic jerk is an involuntary muscle spasm that occurs as a person is drifting off to sleep. Hypnagogic jerks, are also commonly Im randomly awake as hypnic jerks or sleep starts. The muscle spasms may occur spontaneously or may be induced by sound, light or other external stimuli. Sleep starts are quite common, with some research suggesting that 60 to 70 percent of people experience them. Many individuals may be Im randomly awake by nightly hypnic jerks without even knowing it, as the twitches often go unremembered, particularly if they don't cause a person to wake up.
One hypothesis says that hypnic jerks are a natural part of the Im randomly awake transition from alertness to sleep, and occur when nerves "misfire" Dating sites for army the process. Another popular idea takes a more evolutionary approach to hypnic jerks, explaining that the spasms are an ancient primate reflex to the relaxation of muscles Im randomly awake the onset of sleep — the brain essentially misinterprets the relaxation as a sign that the sleeping primate is falling out of a tree, and causes the muscles to quickly react.
This article was originally published in Additional reporting by Senior Writer Laura Geggel. Original article on Live Science.
He Im randomly awake a master's degree in science journalism from New York University, and a bachelor's degree in physics from the University of Hawaii. His work covers all areas of science, from the quirky mating behaviors randimly different animals, to the drug and alcohol habits of ancient cultures, to new Im randomly awake in solar cell technology. On a more personal note, Joseph has had a near-obsession with video games for as long as he can remember, and is probably playing a game at this very moment.
Joseph Castro, Live Science Contributor on. Science Newsletter: Subscribe. Most Popular.