Bad Dream

Not quite a nightmare,
But definitely not a fairy-tail either;
There's nothing worse than waking up from a bad dream.
Emotions on edge,
You spend the rest of the day with a terrible feeling,
Realizing it's was just a dream only makes the day more frustrating.
Like when I dream I've won millions of dollars, only to wake up and discover the truth...
How can I be this upset over something that happened in my mind while I was sleeping?