眠っている間に体がビクッとなる理由
Have you ever felt your body suddenly jump just as you were falling asleep? This is called a “sleep start” or “hypnic jerk.” It happens when your body is relaxing and your brain gets confused. It may think you’re falling, and it quickly tells your muscles to move. That’s why your body jerks! This often happens when you’re very tired or stressed. It’s completely normal and happens to many people.
