Is it normal to rock back and forth while listening to music?

I've rocked side to side since I was very small. When I was a toddler I did it standing up and now I do it sitting down. I do it much less now, but I like to rock while listening to music. I tend to day dream while doing this. I don't like it because I do it to procrastinate or when feeling bored when I could be doing something more productive.

Is this normal?