Strawberries make many healthy food lists because of their antioxidants and vitamins, and also because they taste great so it’s easier to start eating more of them. It’s the Vitamin C in strawberries that helps you out in the sleep department, and they have plenty. Oranges are known for their Vitamin C content as well, but are not as well tolerated as strawberries due to their acidity which can cause heartburn or acid reflux when consumed too close to bedtime for some. You may want to try a strawberry smoothie as a nighttime snack that will help you fall asleep without upsetting your waistline.