I don't know if I've ever had a good dream. All my dreams are gloomy, vivid, depressing, and scary. I have to take Ambien to stay asleep and a beta blocker to stop my heart from racing. However, I also notice that nightmares allow my brain to purge. I know that when I have a really bad day, the nightmare will be especially horrible. However, the next day I feel refreshed--like I got it all out. Has anyone ever experienced what I'm talking about?