It Will Boost Your Immune System

As if you needed another reason to aim for a better night's sleep, getting more Zs will also give your entire immune system a kick. And since stripping down before you hit the sack helps ensure a restful night sleep, you owe it to your health to try. When you're properly rested, your stress level decreases (see no. 4), and stress can have a truly harmful impact on your body's immune response. That means you're more likely to catch that bug that's going around, or take longer to heal if you're already sick. You literally have nothing to lose by sleeping in your birthday suit — except your PJs, that is.