From Dragon Quest Wiki

Nap has a character sleep things off on the field to restore HP & MP. They will be asleep at the start of the next battle.


Dragon Quest VI[edit]

Nap is learned by Spot at level 15. Other characters can learn this ability by advancing to rank 5 of the Gadabout vocation.

Dragon Quest VII[edit]

Nap is learned by advancing to rank 4 as a Shepherd. It only exists in the PS1 version.