No sleep

My 8 week old is not sleeping at night anymore.. she was great the first few weeks getting 4/5 hour stretches.. she now will sleep from 10pm until around 1am/2am but then stays awake until 5am/6am… come the morning I want to sleep and so does she. I’m making the most of sleeping when she does but she can then sleep 4/5 hour stretches again waking up to eat and settling back down easily.. I’m worried we’re just in a backward cycle of her sleeping in the day and not at night.. I know she’s still young so there’s still time but wow am I struggling at night, i EBF, so there’s really no point my partner staying awake with us.. I’d lie if I said there hasn’t been any tears some nights when I feel sooo tired😫