How to get an injured Herobrine stay in bed so you can take care of him:
Step one: Listen half way through his evil speech about him killing you.
Step two: Smack his face.
Step three: Lecture him about you two being friends and how he shouldn't kill you.
Step four: Add 'Hmm?' to the end.
Step five: Watch as Herobrine timidly gets back into bed.
Step six: Be nice to him.
Step seven: Listen to your friends say "What the fuck just happened?".
Step eight: listen to Herobrine yell "THAT'S WHAT I WANNA KNOW!"