This rings very true. I'm a night owl and in the beginning of my career I worked in mostly 13-21 bracket, with strong preference for hours after 17 when office got quiet. It was great, but at some point it started to impact my life very negatively(days just pass and you do not do much beside work). Early mornings are the next best thing. You get quiet, you can easily focus, you're rested and when the day really starts you have something done already, which significantly reduces stress for me. Definitely recommend to everybody.