Since you became Jason's roommate, you never thought that at night he was so... Weird. For example, today.

You hear strange sounds in his room, the only thing you remember is that he came out to be Red Hood but when you walk in, "Hello?" Jason asks, and yes, he has your lipstick on.

This must be another one of the typical, horrible dreams he has from his past, and apparently the Joker is there, in those dreams.