I had a strange dream once, though it wasn't actually last night.

It was normal. Disturbingly normal. I pretty much just dreamed of all the things I had done that day, but the dream wasn't really recollections of things I had done. While everything was completely in the realm of possible and extremely accurate to what I usually did, I remembered enough to know I hadn't actually done those things that day. I started realizing it was a dream and tried to prove it to myself by changing the dream. I found that I couldn't control the dream. At all. I couldn't stop myself and think in the dream, I just kept wandering around my usual day while my head buzzed with confusion. I ended up forgetting pretty much everything after this point.

The next morning when I woke up, I remembered the dream and got extremely confused. I genuinely could not remember whether it was a dream or a memory. It was only through a lot of logical thinking that I convinced myself it was a dream.