@Atralane and I discussed this briefly in this thread: Building lots and lots of scenarios - Scenario Ideas
Basically, we were talking on a thread about senarios that would require unowned beds. This evolved into discussing the possibilities of temporary residency, such as the ability to specify a particular building as an inn.
More to the point, when I start a game, I try to make as many crude beds as I need and then stuff them in a tavern sort of building. But then when I finally build houses and comfy beds for everyone, they stay in the crude beds. Therefore I don’t think there should be any bed assignments, except for maybe the obvious like soldiers sleeping in barracks or travelers staying at an inn. It makes more sense for the settlers to naturally prefer the more comfortable beds, and it would free up more gameplay and senario options.