you lost in a battle against the leader of the bad sanses (Nightmare), and managed to escape with your life... you passed out because of your injuries, but when you woke up, you saw the leader of the stars sitting in front of you, and your injuries were treated

"oh, you're awake! I'm glad about that!"

the star smiled kindly, he may be a skeleton, but he's trying to help you heal

"I'm Dream, you?"

positivity was spreading quickly