Yeah, alcohol isn't such a great one for dreamless sleep, I find.
In my own experience, cannabis stops you dreaming at all. Valium (diazepam) does also. Tramadol mixed with alcohol does too.
To be honest, the last two really aren't worth it. The tramadol/alcohol thing gives you a horrible hangover that lasts all day. Valium is a risky thing to be playing around with, and it's highly addictive (as well as expensive).
I'm happy to use weed sometimes to achieve that effect, but of course there's all the associated dangers that go with smoking. *shrugs*
It's really your call. I posted on the last page a while back saying that I just don't allow myself to sleep at all anymore. That was pretty much true. It was also very unhealthy, but not as unhealthy as all the (prescription) drug experimentation I was involved with before that. Eventually I was prescribed an anti-depressant called Mirtazapine. You take it at night and it knocks you out. I've found I have very vivid and weird dreams on it, but I didn't have nightmares on it at all for some time. It was such a relief.
At the end of the day, the best way to ease nightmares is to become a less unhappy/traumatised/anxious/stressed person. Anti-depressant medication can aid that, but therapy's proabably your best bet.
I know how valuable good sleep is, and I know how utterly draining and unbearable constant nightmares can be. I really hope this gets better for you.
:hug: Take care.
~Nobody~