Actually a member of the mint family, lemon balm is considered a calming herb that has long been used to reduce anxiety, aid sleep and promote healthy digestion. Rather than citrus origins, the name comes from its lemony scent and sour taste. Even before the Middle Ages, lemon balm was used to help heal wounds, treat insect bites and as a sleep aid. When prepared as an essential oil, lemon balm is popular in aromatherapy, especially for relaxing and falling asleep. Because lemon balm is loaded with antioxidants, it helps cells stay safe from the damage of free radicals, and can even promote healthy brain activity.