Pumping at night

My baby will be 3 months next week. He is sleeping from 9pm-7am pretty consistently now which is great. The problem comes in the morning when I wake up...my boobs are so full and painful. I sometimes put haakaa pumps on them...I get a TON of foremilk when I do this. I know that I should be pumping in the middle of the night but it’s so hard to make myself get up and do it when he is sleeping. My question is...when I do get all of that foremilk...what should I do with it? Do I need to throw it out or should I keep it? I know the real answer is I should get up at night and pump 🤣 but some nights it’s just not happening. What do y’all do?