Hi mummy, dont be too worried of storing a lot of breastmilk for your baby girl. Just try to store any excess you may have now while possible. For example if baby tend to wake up less at night, you shld be able to have 1 or 2 feed to store daily. And also do note that while you are back at work, you are also bringing back milk daily if you are able to express milk at work. I had the same trouble as you before I went back to work, but now I am still storing some excess daily. I would think it is still better to express milk once during midnight in order to maintain your supply. You can try to schedule your pumping hours to like every 5hrly so that you just have to wake up once only. This is what I did in order to get sufficient rest. But I also turn in quite early usually 10pm. Following this, I'm still able to TBF my girl up till now though my supply is not as much as some mummies.