Two year Major dejavu that left me petrified in fear?

About two years ago I had this dream, like a scene stuck in my mind, I never thought it ment anything but yesterday I had a major dejavu about that scene, it was about my friend taking coins out of his pocket and I could see a courtyard , that courtyard is in my school and the moment I saw that same scene I saw in my sleep two years ago I isntantly stoped what I was saying and was petrified for 30 seconds not being able to move, I don't understand this , was it even possible?