Daddy's Nightmare is a mode for the game, Who's Your Daddy. It pits 1 Daddy against 3 Babies. The Babies goal in Daddy's Nightmare, is to kill Daddy before he can turn on the power, or once Mommy gets home.
In Daddy's Nightmare, it is nighttime, and Daddy has to collect three gasoline tanks to put into a machine to restore the power. Oh wait, it already says that.