working my regular job and doing a side startup has def made me embrace the night-owl shift. I find that my first hour of night work, say 9-10, is less productive then I'm able to pick up the pace from 10-1, at that point I have to go to sleep or I'm wrecked the next day. Ideally, when I'm able to go 100% on the startup, I would work from 8:30-5:30, come home chill with the fam, then work 9ish-1ish. that way I get 6 hours sleep, have time to hang with kids and still put in a solid 12-13 hours. funny that my dream is to be able to work 13 hours a day, but its really about doing something I love and own, and the crazy hours are a side result.