Is it normal to sometimes confuse dreams and memories?

I take Klonopin every night for a sleep disorder I have, and it seems like it's messing with my memory/dreams. I sometimes wake up and see something and it'll remind me of a part of a dream I had the night before, but I can't really tell if it was a dream or not because I can't remember anything else from the dream.

An example would be what happened today. Last night before I went to bed, I left my glass on the table instead of putting it in the dishwasher. I remember thinking, "I should put this away, but screw it, I'm tired." I woke up today and saw the glass and had a moment where I remembered my girlfriend being upset because I left a glass on the table, but I KNOW she didn't.

Does this happen to anyone else?