@ysmina-- That's not surprising really, both trazodone and alcohol affect the central nervous system and alcohol is a depressant, so it will make things worse.
I do occasionally have a glass of wine even though I'm on this drug. I don't mean to suggest this to anyone and I don't know if it's right to do this, but if I know I'm going to have a drink that day, I skip my dose of trazodone. It's probably not the best idea because some of the medication is always in the bloodstream. But since I react well to trazodone, I haven't had any problems.
It's probably best for everyone to listen to their body and make this decision based on their personal experience with the drug. And obviously, talking to a doctor or pharmacist first is a good idea.