How come when your a wake and someone says to you:

"I have been alive longer then you were born." You just look at them like they nuts. Or ignore them.
But if you here that in a dream, you start freeking out and wake up shaking. That is soooo weird. What is the reason for this?

And explain this:

I made a simple encryption where you count letters in the alphabet and when you get to the end you goto the beging. So I was almost fully awake and thinking about it. Then my mother told me to get dressed. And you know what???? I started thinking about a stack of clothes where one clothes go up untill it gets to the top and then goes to the bottom. What the hell is this?? lol.