I had a dream where I thought I was awake, but I wasn't..help please?

I fell asleep, but then I heard my phone go off so I woke up. I got up, and checked my message, and it was from Curtis who is this guy that i'm in love with, but he said he needed time to think. He's been "thinking" for six months. The message said I love you, and I want to be with you so I like jumped around, and was all happy. I tried to answer the message, but I couldn't so I look over on the couch, and my body is like laying there, but i'm awake standing up. I get all freaked out because I realize i'm not awake, so I really do wake up, but I cant open my eyes or move for like four seconds..I'm able to move, and I checked my messages...I never got a message. This really scared me because I honestly though I was awake, but I wasn't..Does anyone know what happened?