If you are happy to get up at 4am (I get up somewhere between 4 & 6 to feed too) - and like to sleep in until 8am (that IS a sleep in in my house ) - dont worry about changing it - why would you? I assume once he gets up you then give him brekky and then a bottle after that? If not, that is probably what I would change.

Re the 12 hours, each kid is different - my DS slept through 7 - 6 from 4 months withoiut a dreamfeed, DD had a feed more often than not until she was nearly 18 months!

If you are going to work in some capacity, yes it would probably suit to try and push his feed out, but if you are lucky enough to stay at home - do whatever gets you the most rest!!

Hth in some way.