lilium new sleep contains two active ingredients: L THEANINE and Melatonin. L-Theanine exists to work by decreasing 'excitatory' brain chemicals that contribute to stress and anxiety while raising brain chemicals that promote calmness and hence induce sleep. Melatonin is a naturally occurring hormone that aids in the maintenance of a regular sleep cycle (waking and sleeping). As a result, the circadian cycle is regulated and the response to sleep increases.