I have shared a tent with five other women, in temperatures that make you long for the 100F mark on the scale, so I guess my sleeping habits are pretty stable, too. However, preferredly I sleep on my side, holding the pillow in an angular hold (one arm tucked around the upper seam, the other around the side seam), and in a twist position somewhere between on my belly, and on my side. But I move a lot during sleep, it's pretty common for me to wake up in a position perpendicular to the one I took when I went to bed. However, if I'm in bed with someone, I hold my position, I don't move quite as much then.