Question for people who exclusively pump

When your baby sleeps through the night as you still waking up to pump? I have been pumping once a night.. and then 4 times during the day giving breastmilk at during the day and formula at night. This system has been working pretty well for me. By pumping 5 times I get enough to feed my baby before he goes to bed. He's now waking up anywhere between 1-3 times a night depending on his growth spurts and when he goes to bed..

I pump between 3and 6 oz total every 3-6 hours depending on when I can pump.. not sure if my supply will drop if I don't pump at night...