Tips for Engorgement / Regulating Supply?

My LO is just starting to sleep through the night. I pump before I go to bed and if she doesn’t wake up at all, I’m up at 5am since I’m so engorged and very uncomfortable. I’ve been pumping just 5 minutes to relieve myself (get about 5 oz). I plan to keep on breastfeeding for as long as I can manage it. Is there a way I can manage this so I don’t have to wake up to pump and stay engorged for a little bit so my supply regulates? I am terrified of getting mastitis. Or will doing so tank my supply? Any tips would be greatly appreciated. TIA!