Bad Dreams (ability)

Bad Dreams (Japanese: ナイトメア Nightmare) is an Ability introduced in Generation IV. It is the signature Ability of Darkrai. One Pokémon can have this Ability.

In battle
Bad Dreams causes sleeping opponents to lose health each turn. At the end of each turn, each Pokémon that is asleep will lose 1/8 of its maximum HP.

Outside of battle
Bad Dreams has no effect outside of battle.