sleep advice

No kooky pre-bed concoctions or old wives' tales -- just tried-and-true tips we've heard experts recommend time and time again.
What happens when you throw different sleeping styles -- and personalities -- into one bed? Or really, any two individual personalities into one of the most intimate and venerable situations we humans experience? It's actually quite fascinating.
Is good sleep a simple matter of length, the longer the better? If you've ever needed a nap after sleeping too much, you know it isn't that simple. Let's examine the problem through an easier question to answer: what is bad sleep?