Sleep Attack is an ability in the Dragon Quest series. It launches a melee attack that may knock the target unconcious.
Sleep Attack is learned by the funghoul at level 5. It does not cost MP to use.
Called NapAttack in this game, it requires the monster to reach level 7 with 49 HP, 42 attack and 42 intelligence. It is naturally learned by the ArmyAnt, Gulpple, Lipsy, SpotKing, Toadstool and Tonguella.