Science explains sleep paralysis and hypnic jerks

Common sleep phenomena such as sleep paralysis and hypnic jerks are explained through neurological processes rather than supernatural causes.

Sleep paralysis occurs due to a temporary desynchronization in sleep rhythms. During the REM phase, the brain induces muscle atonia to prevent physical movement during dreams. When this disconnection occurs while a person is transitioning between sleep and wakefulness, it can result in an inability to move, often accompanied by sensations of chest pressure or hallucinations.

Hypnic jerks, or hypnic spasms, are involuntary muscle contractions that occur during the transition from wakefulness to sleep. These jerks are often accompanied by a sensation of falling. While the exact cause is not fully understood, hypotheses suggest the nervous system may misinterpret muscle relaxation signals. Factors such as stress, sleep deprivation, and caffeine consumption are known to increase the frequency of these episodes.