A bunk bed.
The Bunk Bed is an object that can be placed in the barracks and used by minions to recover endurance. The restore rate (RR) is 5 points every 10 seconds. It can only be used by minions during the night, and exhausted minions will favour the Mess Hall for replenishing endurance during the day.
If there are valets present, any exhausted minions will be brought and placed on a bunk bed if there are any free.
Bunk beds are available to purchase from the very beginning of the game.