What can cause me not to remember my dreams? its been going on for yrs, i take benadryl, (diphenhydramine) symbastatin and metforming at night now, i do sleep, dont dre

NMS but: Most dreams are readily forgotten even the very vivid ones. Those which wake you up are likely the ones you are more likely to remember. Whether taking benadryl (diphenhydramine) affected the memory or not can't be determined at this time but potentially this drug's anticholinergic effect can impair memory function specially in the elderly.