Are not immune to sleep, bonus to saves vs sleep equal to their character level.
Require 6 hours of sleep.
Favoured classes: Wizard, Scout, Ranger and Druid.
Require 7 hours of sleep
Favoured classes: Fighter, Knight, Cleric and Paladin.
Favoured classes: Wizard (illusionist), Bard and Sorcerer.
Favoured classes: Rogue and Ninja