Oooh that's what my OH does as well! We never wakes up to anything and we now have separate duvets because he was such a duvet snatcher. He also kicks and wriggles and on top of that he snores whenever he's on his back. It's a miracle I get as much sleep as I do, it's never quite enough and don't thinking I ever sleep five hours in one go uninterrupted, there's always something going on!!!