Tired and stressed? Join the club. Forty percent of Americans report having symptoms of insomnia at some point within a given year, according to the National Sleep Foundation. It doesn't matter whether your shut-eye is being hampered by a time change, a stressful job, or some other problem in your life, being tired sucks. And it can lead to serious health problems including heart disease and depression. But before you reach for the latest prescription drug, reach for your fork, or at the very least, your shopping list. Revamping your diet can go a long way towards improving your sleep quality, provided you opt for foods rich in the right sleep-inducing ingredients.