Just to mention, right now, as of the current patch 8, you can get multiple companion scenes in one rest.
Usually, you'll only get one exclamation point, but if you talk to the other characters they'll sometimes have scenes for you also. Even though they didn't display an exclamation point because someone else did.
For example, you can get things like Gale's "go to hell" scene and his vanity grooming scene even when he doesn't have the exclamation point. Things like that all over. Even Astarion's star gazing scene and looking in the mirror scene.
I usually try to talk to all of my companions each rest. And I do so multiple times until their conversation has reverted back to the generic lines.
