Nighttime feeds

My midwife said I can get more sleep at night that I don't have to wake up lo every 3 hours to eat now that he's 8 weeks. But I forgot to ask if I need to pump during these longer stretches of sleep. He's gaining great weight, almost 13 lbs born at 8.4lbs, pees 7+ diapers a day and poops 2+ diapers a day. Im dying for more sleep even if it's just an extra hour. My question is during these longer stretches do I have to pump? And if i don't still it mess with my supply? Also by this age how long did you let baby sleep at night?