I've tried this approach and others. I'm sure for some it can work but ultimately I found you can't cheat time. If you wake up at 5am by 2pm you toast (mentally at least). I've found no real secret to gain extra real hours. The reality is that your mind can only function productively for so long each day. The productivity you feel at 5am is the same you'd feel at 8:00am it just seems more amazing because it's happeni…
I'd say the big advantage of 5am is that nobody's there to bother you, but you could probably pull off the same 2 hours of personal work / day if you were to work after 6pm.