Hi pooh,
i never feed more, just same amt as daytime, but somehow, think they start to differentiate day & night, so night time they just sleep longer..sometimes they got disturbed and moved abit, we either give pacifier or pat them, then they go back to zzz again...we only feed them when their eyes open big big and pacifier and patting dont work!
there were few times we actu tried feed more and see if it lasted them to wake up later, but no...they just woke up ard e same time, but friends said feed fm at night can last longer than feeding bm..no harm trying
as for why they wake up ard 7-8 am even though we feed them ard 5-6 am, i think my boys are just like light censor and alarm clock..even we tried to draw curtain, they will just auto wake up when its time..but wake up not crying but mumbling beside =P