Baby sleeping in bed with you: how to get enough sleep for mama
I think comfort is the name of the game here--if you are nursing, you're going to be side-sleeping a lot, so make sure you have a safe and effective knee pillow. I like the kind that strap to your leg, so you don't have to worry about it drifting and becoming a problem for baby.
Also, another weird thing is that you may not be sleeping with enough covers, because you don't want to cover baby. Again, if nursing, invest in some long-sleeved shirts that you can get your boobs out of easily--henley tops are great for this. Then, you won't get cold in the night if you have to keep your covers at your waist.