Anyone else waking up with sore, achy legs?

crowdofstars

I usually sleep on my back, but my doctor recently encouraged me to start only sleeping on my side. Apparently, when you sleep on your back your uterus, which is growing heavier, can put pressure on a vein that returns blood from your lower body to your heart.

In any case, since I've begun only sleeping on my side, I have been waking up with sore, achy legs from my hips down through my calves. I feel like a ran a marathon the day before. Is anyone else experiencing this? Any ideas as to why it's happening?