Can't distinguish between dream and reality?

Hey, I've had this problem for a while now. At first, my dreams were so real that I would say to people, "Haven't you done this before?"
Things have been getting weirder over the last few days. I texted my girlfriend at 3:03 a.m. (I was asleep, as far as I know) that a stranger was sleeping over at my house because my father wanted it that way. Afterward, I called her and said, "The stranger will be here later."

What is this phenomenon called? How can I limit it because it really gets me into embarrassing situations.

I ask for serious answers.