They've promised that dreams can come true - but forgot to mention that nightmares are dreams, too.
I have had dreams and I have had nightmares, but I have conquered my nightmares because of my dreams.
I believe in everything until it's disproved. So I believe in fairies, the myths, dragons. It all exists, even if it's in your mind. Who's to say that dreams and nightmares aren't as real as the here and now?