You know the drill: Skip the gym, sleep in, and you'll pay for it later with a puffy face and extra weight. Why You Lose Weight When You Sleep? You've probably heard that one before, but do you know why? It turns out that our bodies work hard when we're catching Zs to help us lose weight.

So what's happening while we snooze? Keep reading to find out, and we'll dispel some common myths about weight loss and sleep in the process.