My suggestions as follows:
-Interacting with a bed makes your knight sit on it, rather than lie on it
-Typing "/sleep" while sitting on a bed will make your knight lie on the bed
-Typing "/sit" while sleeping on a bed will make your knight sit up on the side it originated
-Sleep/lying animation on a bed releases Z's

-Typing "/sleep" on a chair will make your knight doze off in its chair

Far-fetched suggestion:

-Bunk-Beds? :D
(Like a normal bed, with another on top of it, with a ladder on one side. Interacting with the ladder will put you on the top bunk, interacting any other region puts you on the bottom bunk.)