Why do you twitch and tremor when you are trying to get to sleep?

Twitching and tremoring while trying to sleep, often referred to as hypnic jerks, can occur as the body transitions from wakefulness to sleep. This phenomenon may be linked to the brain misinterpreting muscle relaxation as a sign of falling, prompting involuntary muscle contractions. Stress, anxiety, and fatigue can exacerbate these occurrences. Overall, they are generally harmless and common among many individuals.