Worked in photography all my life and spend most of my time in a dark room where they use a red light for developing film.
I haven't gone blind yet!
And when I bought my first car that had red lights on the dash instead of white? It made driving at night SO much easier. No glaring white lights in your face that made your pupils close and thereby making night driving more difficult. Such a simple fix making all the lights within the dash red.
OP. Great idea. Red light while sleeping vs a white one is proven to be better for you.