My left thigh is kind of numb from past 1 week, like when I'm sleeping on my left side it's getting very sore and heavy and I don't feel anything in that area. Sometimes it feels like needles are pinching into my thigh and it gets really uncomfortable to change my sleeping position if I lay down on the left side for very long period of time. What is the reason for this issue and please tell me if it's serious  and also How it can be cured at home ?