one breast not emptying

Molly
Ladies I have one breast that won't empty out/even pump out unless I really squeeze it! Can any of you help with this. Also any of you with twins find that you don't make enough for them? If so what have you done to help with that? I know I need to try to pump more but when they sleep for 4.5-5 hours at night, I just want that sleep too. 😳