Inconsistent night sleep

Anyone else’s baby having inconsistent wake periods at night? My 10 week old usually goes 5.5 hours between feedings for the first stretch of night (usually feed 7/7:30 and in bed by 8/8:30 with first wake to eat around 12:30/1am). Last night he had his longest stretch ever so I thought we were finally getting somewhere. He was in bed by 9pm and slept until 3:15am. However, tonight he was asleep by 8:30pm then woke at 10 so I gave him a 10 min Dream feed and then he woke again just 3 hours later at 1:30 so here we are nursing as I write this. What gives??