This happens around my house too...my hubby will say, just make them move, but nope, I'll sit forever, my legs will be asleep, and yet I'll continue to wait. As I type this, cocoa puff is lying on my arm and watching me type...fun!
Oh my gosh! I could never ever move beautiful Smudgey if she snuggled with me. My boys do this to me all the time, and I don't move unless I absolutely need to do something.