DS sleeping more; should I pump?

esd

DS is over birth weight (he was 8lbs 8 oz at birth and yesterday weighed 8lbs 10oz).he's been sleeping great; usually only getting up once at night. He still is eating every 3 or so hours during the day but like last night he ate about 10 pm, went down for bed about 10:30 and didn't get up again until 4 am. I worried that my supply will decrease because of the length he's going overnight. What do you think I should do?