I've been taking melatonin tablets whenever my wacked out sleep schedule gets too out of synch with my work schedule. Which worked fine, when I was working in the same building as the vendor, but once I started a new job, I needed more than ever to keep a firm hand on my sleep schedule, and getting a reliable source of melatonin was becoming harder, yet more important.
I had had the good fortune of discovering Honibe products a few years ago, on a trip to the Maritimes, and was already on their emailing list, so when I spotted a big ol' bottle of melatonin on their email, it was like it had been sent specifically for me.
I find them tasty enough that I don't hurry to get them swallowed, effective enough that I can usually fall asleep within half an hour, and harmless enough to leave on the bedside table (I don't have kids in the house, though, which makes a difference). They are a little stickier than I'd like for something I'm handling basically while climbing into bed, but not so much that I can't cope with them.
I strongly recommend them.