I wouldn't worry to much.. Like Jess said baby's move around on their own anyway. My main concern with night time is that I squash her when I roll over lol.
Im pretty sure that if the baby is uncomfortable they will continue to kick the hell out of you until you move! Mine ALWAYS punches and kicks me if i try to sit cross legged (used to sit this way all the time so often forget I can't do it anymore due to lack of room)