Coincidence or can baby tell? Baby movement

Emily
I've noticed lately that my baby will move more when my belly is covered my a blanket, especially when I'm on my side. He will be wiggling all around and I'll take the blanket off to try to see my belly moving and he immediately stops. When I put my blanket back on he starts again. It's like a game. Can he tell the warmth/light or is it just a coincidence?