Thank you, didn't know that about 45 minute sleep cycles, good to know.
Yes I've substantially cut down feeding at night (she used to wake every 30 - 60 minutes, but only wakes 2 or 3 times a night now), but still do after 2am because if I don't she will get up and do a split night (awake for 2 or 3 hours. She still does this a few times a week, but not every night).
Tried sleep associations before, they do nothing for her. She doesn't make sleep associations.
She eats really well. Three solid meals with many snacks in between. Tonight she had lasagne for dinner, twice. Once at 5pm, and again around 6:30pm. Have tried doing calorie rich suppers and it makes no difference.
Having an active day makes no difference whatsoever either. People with other (regular) babies / toddlers can't relate to this, but her sleep pressure is not impacted by how active or otherwise she has been.
None of the things that 'help babies sleep' ever made any difference with her, from the early days right through to now. Baby massage, swimming, starting solids, getting more active, even her vaccination days, she still never slept.