> This is built on the premise that the modern 8 hour night is settled science. What do you mean by this? Urging people to sleep enough is not really a new and

> This is built on the premise that the modern 8 hour night is settled science. What do you mean by this? Urging people to sleep enough is not really a new and untested concept. Is there a strong reason to think that frequently sleeping <8 hours is unlikely to cause harm? I think it would still be prudent to give all the studies in the article some consideration.