Everything Went Dark

You walk to the end of the hallway and twist the doorknob. It is unlocked. You open the door, it is completely dark but you still walk inside. When you walk in, the door slams shut behind you. Nothing happens for a few seconds, and then everything rewinds. You are forced to go back and perform every action that you did backwards. You end up tucking yourself back into that hospital bed. You close your eyes and fall asleep.