Setting bed ownership? [SOLVED]

I don't seem to have this option, but I've seen people have it on their Let's Plays. Does it come with an expansion pack?

It's probably when you create a "family" that is designated as roommates. Or it could be a mod. Or, I know you can "set as butler's bed" when you employ one at your home.

As far as I know, you can only "set" the butler's bed. But if a sim sleeps in a bed once they will choose to sleep in that same bed again when they are tired. Also, if you are controlling a sim and click on a bed where another sim has slept in, the option "sleep in 's bed" pops up.

Generally when I start out a house, or if I buy new furniture I always have all the household sims go to bed, even if they aren't too tired, just so they will remember where their bed is, and I don't end up with the boy sleeping in the pink room, a child in the master bedroom

Hope this helped.