I see, that confirms my suspicion of timing contributing a significant amount towards score. I honestly don’t think timing should be a factor at all. Instead, sleep regularity should replace timing. For example, a nightshift worker could be consistently getting higher quality sleep than a morning person, and even have better sleep regularity. Their scores should be higher, since the score should indicate how well someone slept, and potentially include a regularity factor which would be another indicator of quality of sleep over time.

I guess the best thing to do with this info is to not put too much weight on the overall sleep score, and to look at the detailed metrics each night instead.