Has anyone successfully carried on breastfeeding whilst giving a bedtime bottle of formula? My DD is 7 weeks on Tuesday and feeds pretty much all night long, she starts cluster feeding from around 4pm with little or no break until 4am when I give up and give her to my OH with a bottle of expressed milk. The longest she goes down for is about 1.5 hours and only once a night and in her swing not the moss basket as she wakes. I'm totally drained and getting increasingly stressed with her nighttime antics. It's been going on for around 3 weeks now 
At the moment she's been having EBM at between 4-5 am in the morning but I'm thinking of trying formula at around midnight to see if it settles her for longer periods in the middle of the night. But I'm worried about introducing formula on a regular basis as I don't want it to affect breastfeeding. Any advice or similar experiences?