Define "dream"
A dream is a wish your heart makes
When you're fast asleep
In dreams you would loose your heart aches
And whatever you wish for you get
NO matter how your heart is grieving
If you keep on believing 
The dream that you wish would come true
Thats "Cinderella's" defination

I think a dream is what you wish for
De'ja vous happen in dreams
Some dreams are so powerful
That they come true
So believe in your dreams and they are sure to come true