Our master bedroom and master bath are in a U shape, with the bottom being a very short hallway / nook. There is no door, but sound and indirect light still travel back and forth.
If she goes to bed first, god forbid I have any lights on or make any sound. I'll turn on the white noise machine to mask any sound, shower in the light from my phone gently casting on the walls; brush my teeth with my manual toothbrush with the sound dampened by the clothes in the walk-in closet and shielded by a door. Any infringement of her delicate sleep is met by much huffing and anger the next morning.
But when I go to bed a bit first, the lights are on, drawers being open/closed repeatedly, electric toothbrush humming, hair dryer blowing, glass jars clinking on countertop.
And in her defense? "You should have gone to bed earlier the night before so you wouldn't be so tired and go to bed early today"