I sometimes love artists who bring us back "down to earth" and display the possible inconvenience the girls suffer now and then (Like Suika's horns).

Makes me wonder though how many people sleep on their back or on their stomach? I always start sleeping on my stomach.

I usually start on my side or stomach and wake facing up.

Ran, just ask Yukari.

Can only sleep on the side, never changing position. The few times I manage to sleep facing up increases the chance of dreaming.