Valerian doesn't so much make you sleepy, as calm your mind. I find that my mind gallops from one thing to the next, especially when I am trying to go to sleep, either first thing on going to bed, or (even more so) if I wake in the night. All the things I haven't done, or want to do, or should do tomorrow, or that have been bugging me, or ... or ... or. Taking valerian before bed helps to stop that bedlam in my head, or at least slow it down enough that I can sleep.
Another thing that sometimes helps me (and is along the lines of the aforementioned meditation) is to concentrate on something fairly boring and non-exciting. For me it is the multiplication tables. I start with 2x2, and occasionally make it to 10x10, but usually am asleep way before that. By concentrating on that it keeps "the gallops" from taking over my mind.
Silly, but it seems to work for me.I also sometimes put a few drops of lavender oil on a handkerchief, and slip it in my pillowcase; this helps when I have a slight headache, and I seem to sleep better too.