The last time I dreamt was in April. I'd make a note about it in my day log txt file when it happens. It's not the same as a normal night's sleep, and I would remember it. But I assume not having REM sleep for the past 4 months would mean reduced cognitive functioning, which is obviously not the case, so maybe I simply cannot remember my dreams most of the time.

Perhaps memory and consciousness are closely related or even the same process, as there is no way to tell them apart from the inside.