This hasn't been my experience. My natural sleep cycle is something like 2am-10am, but for a span of 6 months I was able to develop a habit of 9:30pm-5:30am. In

This hasn't been my experience. My natural sleep cycle is something like 2am-10am, but for a span of 6 months I was able to develop a habit of 9:30pm-5:30am. In the morning I'd immediately go to the gym and then upon return (~7am) start doing work. It was one of the most productive periods of my life. Unfortunately, despite seeing the benefits of the early-morning schedule, over time I reverted back to my night-owl tendencies.