Many scientists believe that infections are much more serious for older people, than younger people, because younger people have much higher levels of the sleep hormone melatonin. Melatonin is not just an essential sleep hormone, but a fabulous anti-oxidant. Some foods that boost melatonin levels are walnuts, pineapple, bananas, oranges, cherries – especially tart cherries. Good sleep positively impacts not just our immune system but EVERY area of health; physically, mentally and emotionally. You simply cannot lose by doing all you can to get the sleep of your dreams.