Rox if it is any consolation I am having exactly same problem with B/F. S feeds all day quite happily, feed, sleep cycle as long as sleep is on my chest. but come late afternoon and through the night she can feed nonstop for hours and still it is never enough. I first top up with ebf but have to then end up resorting to ff. I try to limit it to small amounts but she usually ends up taking about 60/90ml of ff in night. I have asked mw, hv, bf counsellors and none of them seem to get just how hungry she is at night. By 3-4am I am beyond despair as to what to do so figure that ff is better than a starving baby. No amount of breast seems to touch her sides and my breasts feel bruised and sore from constant feeding. HV watched me feed and thinks that my technique is fine so I am at a loss to know what to do differently.
My milk seems adequate for her daytime but I just can't fathom what to do if I didn't have the ff to fall back on. This first happened on day2 in hospital where the nurses were worried about her and asked if I would allow them to give her a tiny amount of ff. she seems to be able to switch between bottle and breast ok but I feel as if I have failed in giving her the best start with just bf.
I am using an app to monitor the b/f and basically when she is like this I a feeding her every hour apart from after the ff when she sleeps for 4 hours or so.
She is being weighed again today - as weight static at 11 days i really hope she has gained enough to keep her out of hospital.
I hope just knowing that you are not alone with this helps sorry I don't yet have a solution though. If I get a breakthrough I will let you know.