getting baby to sleep earlier

My daughter is 9 weeks old and is EBF. Usually in the evenings 5:30ish-10 she cluster feed close together. She usually falls asleep for the night around 10 or 11. She will usually eat again sometime around 2am or 3am and then sleep still 6am-7am. Right now since I am on maternity leave we go back to sleep then until 9am or so but I go back to work in a few weeks. I am trying to figure out how to get her to bed at an early time but she just seems to stay up late at night. Any advice?