HI @jayrob624 -- I just had that happen again last night. It's jarring. Hypnic jerks, also called sleep starts, are sudden involuntary muscle contractions that make your legs and/or body jerk significantly. They tend to happen as you transition from wakefulness to sleep and often make you feel like you're falling. It can be pretty startling. It can feel like a shock through your body as you described. It's very common and normal. Sweet dreams!