I worked a job before that did require some heavy thinking, design, solving problems, etc., and for some reason I only get creative from 1am to 4am, and I did an amazing job in that period for whatever work was required, only later that my boss didn’t like it and wanted to force me to do normal schedule, in the office, my outcome degraded significantly and eventually had to leave the work, it’s just I couldn’t handle the mornings besides replying to some emails.