I think it’s worth accompanying this study with the Simpson’s Paradox [0]. I don’t want to dismiss the conclusions of the paper, but temper expectations for individuals considering lifestyle changes.<p>[0] - <a href="https://en.m.wikipedia.org/wiki/Simpson%27s_paradox" rel="nofollow">https://en.m.wikipedia.org/wiki/Simpson%27s_paradox</a>
I wish they'd used hours after waking/before sleeping vs simply defining morning as between 4am and 12:00pm or evening as being between 5pm and 4:am<p>People who wake and work later would normally drink coffee more often at later hours and there's already a bunch a research showing 2nd/3rd shifts can cause health issues which wouldn't show up in the people who get up at 5am and have a cup or two in the next few hours.