The Pokemon takes damage equal to 1/8 of its max HP at the end of every turn. Poison- and Steel-type Pokemon are unaffected.

The Pokemon has a 12.5% chance of being unable to use moves. Its Speed stat is also halved. Electric-type Pokemon are unaffected.

The Pokemon can’t use moves other than Snore or Sleep Talk. After a Pokemon is put to sleep, it will remain asleep on its first turn, it will have a 1-in-3 chance of being cured on its second turn, and it will be cured on its third turn. A Pokemon that used the move Rest has no chance of being cured until its third turn.