Help!! Need to decrease supply

Sydney • 26. Army wife of 6 years. 🇺🇸 Momma to 1 angel baby 👼 and 1 earthly baby AJH 💙 02/18

I am trying to decrease my supply by only pumping about 10 mins every 4 hrs. But my boobs stay so full and painful. Especially the middle of the night since I only pump once during the night. It's been 7 hours and I feel like my boobs are going to explode. How can I decrease this? pump just enough to relieve pressure at night? Does the pain eventually stop? I don't want to get clogged..