The reason I'm asking is about 30 minutes I was sleeping and having a PTSD/Nightmare. I've been taking Prazosin 1mg. in the morning and 1mg. in the evening. Has been working fine up until now. I don't know if this is an isolated incident or the dosage is no longer therapeutic. I'm still shaken up by this nightmare. I called my psychologist to relay this concern to my psychiatrist. I prefer dreamless sleep over all the crap I've been through in life, instead of self-medicating.