My 16 week DS has gone through the night a couple of times (7-7) in the past 10 days. We dream feed at around 10.30. Although he's a noisy bugger - loads of whimpers, thrashing and finger sucking from 3-4.30ish, on those nights he's not woken up, just gone straight through.
Other nights, he doesn't really wake and cry for food EVER, just wakes and makes a bit more noise. I give him a tiny amount of formula and he hits the sack again.
The fact that he's not desperately hunger makes me not want to feed him then, but I wonder what else it is that is stopping him sleep through. Do you think he might get cold? I swaddle him in a swaddling blanket and tuck him into his cot in a circular blanket. He manages to get his fingers out the swaddle mid way through the night and the room temp does drop. Is he cold?
Otherwise any other thoughts why he's not just staying asleep? He's a good settler/resettler.