As stated already, Remeron is great for sleep but also an antidepressant. No odd effects and puts you gently to sleep, from what I've experienced.
Ambien, on the right dose, also does the same thing. Doesn't make you fall over sleepy, but if you lay down in bed, it's quite easy to fall asleep. I must share a story here though... once I was having a particularly hard time sleeping so I took 10mg instead of 5... which is an extremely low dose anyway. Well it pretty much knocked me on my ass, and I'm sure if I stayed up, I'd have been one of those sleepwalker stories. I don't remember getting to my bed to be honest. But, all that aside, it does do it's job. (I in no way reccommend doing what I did, I was just pointing out what you'll feel like if the dose is too high for you <img src="i/expressions/face-icon-small-tongue.gif" border="0">)
One thing to note about sleeping aids is they also force you to have a schedule. Some of my best months this year (health AND mood wise) were when I was religiously taking ambien at 12midnight every day... I'd wake up at 8:30, no alarm, feeling refresh and ready for anything. So I hope this does the same for you, too. <img src="i/expressions/face-icon-small-smile.gif" border="0"> Sleep well, when you get there. <img src="i/expressions/face-icon-small-wink.gif" border="0">