Oddly, a glass of cherry juice may be an effective way to fall asleep faster, says a team of researchers from the University of Pennsylvania and University of Rochester. In their study, they found that cherries, particularly tart cherries, naturally boosted the body's supply of melatonin, which helped people with insomnia. While the jury is still out on how much juice or how many cherries are needed to make you sleepy, experts say sipping a glass of cherry juice (available at most natural foods stores) or having a serving of fresh, frozen or dried cherries before bedtime couldn't hurt.