Hi, DD started sleeping through quite early on, i would end up so full id have to get up and express in the night so they didnt explode!! i started to express just before i went to bed and that worked great for me.
Unfortunatley it didnt last, after a few months she started waking in the night again. So make the most of it!!!
Didnt seem to affect my supply and i only got AF back two months ago (DDis 16 months) so didnt affect that either!