Help dropping a pump session

So my daughter is 9 month and sleep through the night most times. I usually breastfed her throughout the day between foods and pump at 7pm at night and again at 3am due to engorge boobs and around 6 am -7 am she breastfed . How can I get rid of the 3 am pumping session without getting clumps and stuff and her like choking on my boob milk lol ?(she has acid reflux ) ?Any tips would really help . Will my production be affected during the day when I do stop pumping at 3 am ? How do I breastfed her where she don’t choke or I don’t have to worry because it won’t affect her ?