Rittgil,
I've run across all kinds of people that have positional or postural triggers. Me included. After eating a big meal, every time I bend over I'll get a
PVC. Sometimes after laying in bed 10-20 minutes I'll get a few. I know some people get them when they lay on their left side - when it comes to
PVC's I think I'm ambidextrous (or something), because I get them no matter which side I lay on. Switching from one side to the other sometimes helps for a little while (hopefully enough that I can drift off to sleep).
So yeah - it ahppens to me, too.