Summarized List: Status Effects
A rested creature is feeling energized with a clear mind from a good rest. Each level of Rested grants a +1 status bonus to all skill checks and saves, up to a maximum of 3 levels.
You become rested from sleep whenever you regain more hit points than you need. Every hour you sleep while already at full health grants you one level of Rested, up to the maximum of three. You can't gain this bonus if you have an injury or are exhausted.
You lose all levels of Rested four hours after your rest period ends, or if you suffer any negative status effects during that time.