insomnia
"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't sleep without it. I don'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."