Doze off and keep your metabolism burning through the night with this delicious smoothie courtesy of Dr. Michael Breus, PhD, The Sleep Doctor. Cherries are one of the richest known sources of melatonin, the sleep hormone that recent studies have shown can also help reverse the effects of aging, while bananas contain loads of magnesium, a calming mineral. Lastly, soy milk is high in tryptophan, the sleep-inducing amino acid. Sweet dreams!