Chances are that one thing about your sleep routine is pretty consistent. Even if your bedtime changes nightly, or you wake up at wildly different times each morning, there's probably one position that's your favorite for slumber. Unfortunately, the position that you find most comfortable might end up causing health problems, ranging from aches to sleep apnea. Learn about the pros and cons of common ways to sleep, and discover easy tips on making each position a little bit better for you.