Sleep help

My little bundle of joy does not sleep more than 45 mins to 1 hr in a stretch even at night and needs to be breastfed or rock to go back to sleep ...she is 5 and a half months already still no improvement in sleep pattern..if anything it keeps getting worse..I make sure she is fed full before sleeping , fresh diaper, proper temperature, ...still she will wake up after an hour all sleepy and cries for feeding to sleep..this is tiring ...is there anything I should change or do differently to break her 45 mins sleep cycle and make it longer? Suggestions, advice, ideas anything please😓