Originally Posted by SergiuB
I tried biphasic for 1 week. It worked, I slept 3 hours from 2am to 5am and had a 1,5hrs nap at 6pm, but all the time I was feeling tired at 2-4pm.
When I made the switch
it took a week for my body to adapt to the new schedule, with the same result - tired by mid-afternoon. After that, however, it was all good. Regardless of the schedule you decide to try, give it a month or so before changing it.