Valerian and Melatonin are two herbal suppliments when, taken before bed, can aid with sleeping. Celestial Seasonings has a Sleepytime tea with the Valerian. It won't affect your wakefulness or performance the next day and have found them useful. I'm used to a bit of insomnia, though, and usually don't take them unless I go more than two days or so with none. It's all a thinking thing. Just can't stop sometimes.