insomnia
"After 10 years taking Ambien for insomnia, my doctor switched me to Trazodone because the Ambien had become ineffective, giving me only 3-4 hours sleep per night. The Trazodone, while different, does seem to work somewhat. The nightmares many of you speak of are most likely being caused by the withdrawal from the Ambien or whatever other sleep drug your Trazodone has replaced. I know that horriffic nightmares have always been an issue for me when missing a night of Ambien on an occasion when I had run out."