Trazodone (note the spelling) worked great for me a few years ago (mainly as an antidepressant, though I had disturbed sleep as well).

Cautions: it acts VERY suddenly, like being whacked on the head with a hammer. You need to time the dose right - too early and you'll be staggering around like a drunk. And it can cause reflux, so eat something with it.

I doubt if anything that strongly sedative is safe for an alcoholic. It comes with cautions about abuse potential.