As somebody who uses sleep aids, I've tried everything out there. The most effective sleep aid by far is ambien, but I try to limit use of that to once or twice a week, tops. The thing I have found most useful non prescription is actually melatonin, 1mg sublingual.
On a number of occasions, I have tried Valerian root...it is usually used in combination with melatonin and other things as a sleep aid. I read up on it, and remember reading something about night terrors....that is a series of bad nightmares experienced from valerian. I dismissed it at first, of course. But as I used valerian a couple of times, it only took three nights until i realized I was experiencing a series of worsening nightmares off this stuff. Needless to say I stopped using it, but have since that time tried valerian twice again, for a period of three days, and experienced exactly the same thing.
Has anybody else experienced this? It really is uncanny.