Catapres (Clonidine) helps with nightmares but does seem to also limit dreaming recall overall. You still dream some, but the dreams are less vivid, mostly. There still seem to be some dreams, but about 50%. I am not bothered. It's worth it to avoid nightmares. They occur more as "troubled dreams" and don't leave me as tired and upset the next day.
Unfortunately, I'm tapering off Clonidine due to bad side effect of limited circulation to the toes causing major issues. I can't be sure it's the Clonidine, but that is the 1st thing to have to let go off, as losing circulation to the digits is an issue I'm having and C. is often the causing factor. But I've been stable for almost a year, so maybe don't need it much now anyway.
Muse