I think baby is treating u as pacifier. Hence you need to quit this habit.
Once baby fall asleep, you can feel it urself, de-latch him and let him continue sleep. Don't let him continue suckle non-stop and throughout if not you will need a pacifier to try out is it that baby really suckling for comfort or baby is hungry.
If he cry in middle, i will latch him and continue to sleep, but he will de-latch himself and continue to sleep. Hence i always wake up 1 breast showing to the world.
If you are latching at night only, don't pump, let your breast season. I only pump before i sleep after i latch him to sleep. And pump again when i totally wake up in the morning. The rest of the pump is in 3-4 hours from morning to after latching to sleep that is last pump.
Everytime i pump is after i latch.
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Mama of 1 bouncy prince