Peppermint tea is my absolute favorite herbal tea for sleep and just about anything else actually. Peppermint is the holy grail of teas in my opinion. It cures so many issues, such as the inability to focus, headaches, poor digestive function, bloating, stress, tension, anxiety, and best of all, insomnia. I add dried peppermint leaf tea to smoothies for a refreshing taste and drink it as a tea form with most of my meals for great digestion. Though it doesn't make you sleepy by initially drinking it, at night it has the powerful effect to relieve your body and mind from stress and anxiety, which helps you nod off faster. I buy mine in a tea bag form as well for convenience. Peppermint leaf is pretty cheap in dried form from sources like Heather’s Tummy Teas, which is organic and costs around $11 for a 5 ounce canister, which lasts about 3 months.