How to stop breastfeeding ?

My baby girl is 8 month old. I am going back to work night shifts (8pm-4am) I won't have time to pump and honestly I do want to stop BF . She takes formula similac when hungry with no problem.  But at night time Wakes up like 3-4 times just to eat for a minute ... Should I just stop it right away ? Day time no problem but what to do with nights ? Please share some experience