When i lay on my back it !akes my right leg hurt & it hurts to move to get up or to move my leg?

Possible Sciatica: The nerves which supply feeling to your legs come out of the spine and come together to travel in a big nerve called the Sciatic nerve. I f any or all of these nerves get pinched or strained you could get leg pain. Laying on the back stretches this nerve and arch in low back could pinch the nerve. When on back, bend and put pillows under the knees. See doctor for correct evaluation and treatment.