For a bedroom light logger, would you use a BH1750, or does it lose too much detail near darkness? The practical question is whether a hallway lamp or an outdoor light is reaching the pillow. A sensor beside the window would presumably give a different answer.

I would keep the node away from the bed and disable its indicator LEDs. Has anyone compared readings at pillow height with readings elsewhere in the room? I am interested in sensor placement and low-light limits; a lux reading alone cannot establish why someone is sleeping badly.