I did 21/9 during college. It was great! When bedtime came, I was actually tired, and thus fell asleep quickly. I was in sync with the world every four days. My

I did 21/9 during college. It was great! When bedtime came, I was actually tired, and thus fell asleep quickly. I was in sync with the world every four days. My work and school schedules were such that once per week I'd have to skip sleep, but I seemed to suffer no apparent deficit. When on a standard cycle, I'd lie awake in bed bored out of my mind for _hours_ upon hours, fall asleep with only time for 0.3 to 2.5 sleep cycles, wake up in sleep-deprived pain and misery. (X_X) In recent years, I deal with the standard cycle with the various in-vogue things like scheduled bluelight blocking, zero-lux bedroom (cities at night are so fekking bright compared to when I was a child), and sometimes morning-only caffeine sources. I miss my 21/9.