Why do we feel a 'jolt' just before falling asleep?

We feel a jolt just before falling asleep because our brain gives us a little signal to help us go from being awake to being sleepy.

Imagine you're playing with your favorite toy, you're happy and excited. But then, all of a sudden, it feels like someone gently taps you on the shoulder and says, "Time for bed!" That tap is what makes you feel that jolt. It's like when you're running around and suddenly stop, you might feel a little push or pull inside your body.

Your brain has a special team of helpers called sleep signals. When it’s time to sleep, they send out a quick message through your nervous system, kind of like sending a fast runner on a relay race. This message makes you feel that jolt, letting you know it's time to relax and drift off into dreams.

It's like when you're eating candy and then suddenly stop, your mouth might feel a little tingly, or your stomach might give a little twist. That’s your body reacting to the change, just like your brain reacts with that jolt before sleep.