Melatonin is something your body produces naturally (it is a hormone that helps regulate our circadian rhythms - sleep/waking cycles), so this really is not a supplement or a medication. It is a nice alternative to over-the-counter sleep aids. It is perfectly okay to take melatonin if you have less than 7 to 8 hours to devote to sleep, and it will not leave you feeling like an extra in a George A. Romero flick the next morning. I can always find melatonin at CVS for a good price - 240 tablets were $11.99. These are the 3mg tablets, but I think I might need the 5mg tablets next time. I have trouble getting the "hamster wheel" to stop spinning, when I lie down to go to sleep at night, and these melatonin tablets were helping with that, at first, but I think my body is getting used to them. I do not take them every night, but probably more than I should. It has gotten to the point where they do not really seem to help much any more, but I have noticed that when I stop taking them for a week or so, they work just fine the next time I take them.