What does it mean when you have a dream and it comes true

it's called a deja vu

Explanation:

Its the feeling that you have lived through something already, it can be an action or something you feel you have seen before.; )

Read below.

Explanation:

When you have a dream that predicts the future, it is called a mantic dream. Your body senses what's going to happen next in the future. When you go to sleep, your mind tells you that that certain event is going to happen in the future.