I'd be interested in the response to this, as I have posted a similar email on the PUPD message board!
I feel for you, as my LO has been waking at about 5 in the morning too (after about 2 waking in the night, one for a feed and the other out of habit for him, I think). An extra hour or 1.5 hours would make a world of difference for me in the morning, as I am returning to work full time in a couple of weeks and it's going to be very full on....