nightly sleep struggle

My baby girl is 8 weeks today. Every night is a struggle to get her to fall asleep. She wakes up around 9-10pm and stays awake until 1-2am. Then she's down for about a 4-6 hour stretch. Then feeds again and is down for another 2 hour stretch where I usually go back to sleep also. However I go back to work in 4 weeks and 4 hours a night isnt going to work for me! Any advice on getting baby to sleep earlier? Or sleep routines in general? It's like she doesn't realize when she goes down at 7pm it's bedtime! We are swaddling and using white noise also.