Every night ...

Seriously it's like clockwork. Every night at around 12 am my almost 2 week old gets REALLY fussy and wants to cluster feed, despite literally like puking up breast milk like he's gotten over fed. He does this in and out of sleep and fussiness until about 3 am . Can anybody tell me wth is wrong? It's seriously driving me up the wall. I change his diaper and he's dry and everything! Help!!!