May be a slightly pointless suggeston, but the thought came from playing FrostPunk. Whether this gets used or not will depend on the player’s play style, but none the less.
Hearthlings that don’t have beds should go to the camp stand to sleep. Like how they gather around the stone hearth at night, if a Hearthling doesn’t have a bed they can sleep in (presumably at the beginning of the game) then at night (or whenever they sleep) they should gather around the camp stand rather than just sleeping wherever they’re at.
Hearthlings are optimistic folks. They keep hoping that a bed will miraculously appear until they have no energy at all and just black out from exhaustion.
Having them go back to sleep around stone hearth feels right. Currently when they’re rescued, before you have any beds, they lay them down near the standard/hearth.