"i am a 18 year old girl,and since i was 13  i only take melatonin on nights when my sleeping schedule is messed up or i have anxiety about something and it really does help. both my mom and brother take it every night - they both have insomnia and anxiety - and they depend on it. they can&#039;t sleep without it. i don&#039;t want that to happen to me so i only take it every so often when i am in need of it and it really does work."