I'd say he's building up your supply for Wonder Week 12. My DD was sleeping through at 10 weeks but she had 3 nights in a row during her 12th week where she woke at 3am for a feed.

Feeding more during the day definitely helped our DD to sleep longer at night. We had lots of breastfeeding issues so we had to give her top ups after every feed until about 8 weeks. She got into a good night routine very early on and was doing a 5 hour stretch for the first half of her night from about 4 weeks.

It may not work for all babies but I honestly think there is some truth to the theory. It's worth a shot anyway. Good luck!