Sleeping problems

This has come about pretty recently and I was hoping that someone maybe able to help. When I feel really tired and I am trying to drop off to sleep I get this feeling that goes up from my toes to my head and is not very comfortable. It wakes me up and I have been really struggling to get to sleep. I also get the odd time where one of my lims just jerks by itself.

Has anyone expierneced this or offer any advice