I enjoyed the book. If you're interested, my comment history on HN contains a reference to i somewhere, where someone linked to serious criticism about many of

I enjoyed the book. If you're interested, my comment history on HN contains a reference to i somewhere, where someone linked to serious criticism about many of the book's claims, and a reply to said criticism by Matthew Walker. Regarding the alarms: I find that consistency is much more important for mee than total hours of sleep. I'm much better on a consistent 7h/day than on 8h/day where my sleep/wake time moves around.