I think you misunderstood? I meant: we understand one way in which sleep loss can kill sufficiently well that we don't need to describe its lethality as "oddly

I think you misunderstood? I meant: we understand one way in which sleep loss can kill sufficiently well that we don't need to describe its lethality as "oddly hard to explain". That doesn't mean there isn't more to learn about sleep, or other things about sleep that are, indeed, oddly hard to explain.