That only works as long as everything works. Soon as you car breaks down coming back from the gym, soon as your kid has a flu and you've got to take him to the hospital and come back at 2 AM, everything has broken down. Then the next day you can't remain on 9pm to 4am sleep anymore, you're then catching up with the late stuff from day before. Weekends then become compensation for the day before the day before when you had the kid flu and then ....well I've been there, done that, and this kind of schedule simply does not work(for me).