for many people, especially those with full schedules the time sequences might be inconvenient.
I switched my sleeping routines around a couple of years ago. I was one of those (ignorant) people who believed that I needed 8 hours of sleep a day. Instead I swapped it for 5.5 hours at night and then a 45 minute 'powernap' in the late afternoon. I must admit that it wasn't easy at first, but like anything it's only a habit.
Now I just have soooo much more time to live life and not sleep may way through it. AND...the best part is that I am so much more productive.