Have you tried this, @bluedemon? I spent a few weeks in biphasic sleep. I accidentally fell in it due to some disorders (I'm a night owl but got woken up at the wrong time twice in a row and that's all it took to switch me). But that's as far as I've gotten with this.
I haven't tried this technique.. i think i will though.. i could use more hours in my life while i'm young because as i'm getting older we cannot go back to spend the past time.. =)
I think there are plenty of secondary effects and trying to sustain you might harm you in many ways. Read more about it at least. But to each their own; I wish you good luck. :)