Yes, I've had that feeling, too. It's nothing to be alarmed about. Once you stop focusing on it, it will dissipate. Just keep going about whatever you're doing when you have these symptoms. If you're trying to go to sleep, but you're feeling that and the feelings persist, then get up and do something so you can get rid of the extra energy. They are symptoms, nothing more, nothing less, they won't harm you. Try to find another focus. Wish you the best!