Sleeping Beauty: This type of sleeper sleeps on the side, back slightly curled with knees bent and arms folded.
The problem - None. This is the healthiest position to sleep in. This posture complements the natural curvature of the spine.
To make it even better - Add comfort and reduce stress on the hips by putting a pillow between your knees. Use a pillow of moderate height to support the head. Try a water pillow that can be easily adjusted. If there is room, stretch arms out front. If you have high blood pressure, try sleeping on the left side. If you are prone to kidney stones on one side, side-sleep on the other side.