For the past 3 months I wake up in the middle of the night with my left thigh numb. Maybe 2-3 times a week. As soon as I wake up and walk around for about a minute the numbness is gone. I do not feel numbness at all during the day. When I wake up at my regular time the numbness is not there usually, though one time it was also in the right thigh. Please help. I am a 27 year old male, not over weight, and I do not have any health issues. I do not smoke or drink. I did see a regular doctor, and they just said to get an MRI. I do not think that is needed. If an MRI is needed, are there any health risks with that?