Sleep

Sleeping is a status ailment in the Mario role-playing games.

Super Mario RPG: Legend of the Seven Stars
In Super Mario RPG: Legend of the Seven Stars, sleep is one of the more common status ailments that the player can have. A physical attack will wake a character from sleep, but a magical attack will not. While sleeping, a character is completely immobile and helpless. Additionally, Princess Toadstool is able to afflict this condition on enemies.

Paper Mario
The afflicted will fall asleep, preventing them from moving for a few turns. Unlike in Super Mario RPG: Legend of the Seven Stars, the character cannot be woken up until the effect wears off.

Paper Mario: The Thousand-Year Door
In this game, the afflicted will fall asleep, but when attacked, there is a chance that they will wake up. This is indicated by a small exclamation point over the character when they are attacked. Its icon is a Sleepy Sheep. A number by the Sleepy Sheep indicates how long the victim will be asleep for.

Super Paper Mario
The afflicted will fall asleep, and they will have to wake up by shaking the Wii Remote.

Trivia

 * In Super Mario 64 and Super Mario Sunshine, Super Mario Galaxy, and Super Mario Galaxy 2, if Mario is left alone and does not move for a while, he will sit/lay down and go to sleep. Mario and his Partner will also fall asleep in a similar manner in Paper Mario: The Thousand-Year Door, although they will sleep standing. Luigi can cause Mario to sleep by telling him one of his overly long stories.