i've read in the papers about health concerns for call center employees. As far as i know, melatonin is produced by the body to help induce sleep and calm the nervous system (and make skin beaUtiful? not sure). melatonin is also the natural cancer fighter. the prob with people who work night shifts for a period of time is that since they dont sleep in regular patterns, they cant produce melatonin normally. same with people who have insomnia. so some people take melatonin orally to help induce sleep and assist in keeping a sleeping pattern. ayaw lang anad. kung mka sleep ka without, ayaw na take pra maka produce melatonin imo body normally. I take Sleepasil. P12.00 at watsons. it has other herbs too. check www.sleepasil.com.