Shaking one's legs when sitting

My question is that whether it is haram or anything difficulties weather telling in Islam shaking your legs while sitting on bed or any anywhere like on chair Suraj about the reality behind this is it true or not some people says keep shaking legs while sitting on bed is the act of illness or will come illness in your home at your home please suggest or give me justify answer in the light of Islam or an hadees thank you so much.