Melatonin - tried it once a couple of weeks ago, slept like a rock but woke up the next day pretty groggy.
Valerian - makes me drowsy enough to aid in getting to sleep. I've only tried the tea made from dried roots, which smells pretty horrible. I'm not kidding. I knew a girl in college who claimed such things wouldn't affect her, drank two cups of the tea and was sleeping on the FLOOR within an hour.
Chamomile - mildly relaxing, but doesn't really make me sleep. Tastes ok though.
Mugwort - not so much for sleep inducement, but really works for making you have crazy vivd dreams, and recalling them the next day.
Also, aren't many homeopathic remedies so dilute as to contain NO active ingredients other than distilled water?