you don't produce as much at night because the milk has different contents (fattier) but baby could be cluster feeding at night.. my LO did that for a while.

Do you have an electric pump or a manual one? And do you have anyone to help you pump at night while she's nursing?

I never get a chance because she constantly nursing. I know she's trying to train them but I'd like to help her along so we can have easier evenings @marzuniversal

Start pumping at night for a few days. Your body should start creating more because it thinks it's time to make it. I think. Just a theory.