Thank you both for great ideas and advice. You are a credit to this community and a valued resource of a wealth of information and experience.
So, for now, I will go with a dumb light/motion-detecting stick-on little light that has 2 brightness settings. One will go under the bed, the other will go in the bathroom, facing the entrance. This should provide functionality without over-engineering it. I ended up getting this:
https://www.amazon.com/gp/product/B07PB9Z1ZZ/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1