I saw an AmbienCR commercial and at the end, the commentator's voice says, "Some people have reported Sleep-walking with amnesia of the event."
I'm thinkin, "Holy shit. I've slept walked before but not like that dude on RIU."
I understand why your Dr bumped down the dose, especially if he believes you won't sleep walk anymore and this is all that can make you sleep. If you tell your Dr that you are not comfortable' takin' ambien, and he's a good Dr, then he should give you something else.
I know a guy (very close friend) that refused to take ambien in any form. He told his doctor that and supposedly the Dr said "Yeah, I wouldn't wanna take the chance of taking 1 too many and then wake up injured." I believe that because the guy is my Dr, too. So now, my buddy gets a Rx for valium and one for Xanax. Granted, he is a high strung type and that can really go overboard on minutia, but he as directed to take xanax for sleep. So far, so good.