Why do i do this....?!

I always pace like to the extreme. I'll be sitting down and then i feel kind of restless and feel the need to pace like i HAVE to or something, it's normally worse at night time, if i do it during the day then i will pace for about 15-30 mins but if i do it at night i will pace for 1hr- 3hrs! It's just like i do it to relieve my legs or something, is this normal.? Is anything wrong.?

Thanks xxxHealth Question & Answer

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