Key Benefits Melatonin helps regulate the sleep-wake cycle. Calming herbs promote relaxation for better sleep. Even the occasional sleepless night can undermine health, vitality and mood. Sleep Now is a natural, non-addictive herbal formula with melatonin, that can help you enjoy a good night's sleep and awaken refreshed the next day. Usage Use with Herbalife's Tang Kuei and Relax Now for stress management.