Is there a best sleep position? Dig into how sleeping on your side, back, or stomach can impact your body and health. -- Sleep positions go by countless creative names— the zombie, mountain climber, free faller, soldier, and more. Yet sleep experts typically simplify them into the basic types: side, stomach, or back. Individual sleep styles are highly personal, but how we spend the night affects our bodies and health in several ways. So, what’s the best position to sleep in? Rachel Marie E. Salas investigates.