why do i constantly hhave too be shaking my legg?

I had similar problem when I was teenager as well. The moment I sat down I have started to shake or move my leg in some weird rhythm. No music or any kind of sound was making me do this but I just had the need to move my leg or my foot. Even when I was lying down, watching television or reading some book I was feeling the urge to move my leg. Sometimes I thought it was because I am too nervous or I need to smoke but now I think that it was just a habit.

I don’t know how or when but I have stopped with that and now maybe just sometimes I start to move my leg but it doesn’t give me that feeling like it used to before. I hope this was helpful.