Pump or sleep

PA
Baby sleeps 6 hours at night, then eats and another very long stretch (like 4 hours some mornings). Question, should I set an alarm and pump while he sleeps or just sleep myself and let my supply regulate to his routine. He's above birth weight so I don't feel a need to wake him up to eat. He eats every 1.5-2 hours during the day and every hour in the evening so he's getting plenty of feeds per day. 

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