Leg cramping at night.

Anyone else experience this? Today I am 6 weeks but the cramping in my right leg started before I knew I was already pregnant. Then the cramping started in my left leg and it only seems to happen when I'm sleeping because the pain wakes me up and hence it's hard to stay asleep. I've already started to practice sleeping on my sides and not my belly or back with a pillow between my legs. It's only a night when my legs cramp.

Help! Anyone else experience this? It's unnerving and quite annoying.