Just as you drift off, your whole body can suddenly jump. It is all a tiny mix-up in your brain.
What is that jump?
Doctors call it a hypnic jerk, and most people get one at some point. It often comes with a quick feeling of falling or tripping.
Why does it happen?
As you fall asleep, your muscles slowly relax. Sleep experts think your brain can mistake that for a real fall. So it sends a quick jolt to make you catch yourself.
What makes it worse?
Coffee, stress, too little sleep, and late workouts make it more likely. It is harmless, but worrying about it can make it happen more.
One more thing
Some scientists even think it goes back to when our ancestors slept in trees. A quick jolt may have helped them hold on tight.
