Is it normal to jerk when falling asleep?
Yep.Totally normal
Yes—sudden jerks as you’re falling asleep are very common and usually harmless. They’re often called sleep starts or hypnic jerks.
Your body can give a quick twitch or jolt as it shifts into sleep. Sometimes it comes with a falling sensation, which can make the whole thing feel startling, but it’s usually just a normal sleep transition.
It may happen more when you’re stressed, overtired, or have had caffeine, though it can show up for no obvious reason. Annoying, perhaps; generally nothing to worry about.