Answer:
I can generate fear and some say I come out of your ears. I am as quiet as a mouse but not welcomed in the house.
I am commonly ate before I'm born and after I'm dead.
Alone I am 24th with a friend I am 20. Another friend and I am unclean.
I may seem real but it always turns out I was never there in the first place... you only see me during a certain resting stage.
The warmer I am, the fresher I am. What am I?
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.