Baby is soo fussy at night ! 😫

Anyone else’s baby get really fussy at night ? My baby is 3 weeks old and he takes good naps and is a happy baby all thru out the day . Come 9pm when we’re ready for bed He is not a happy camper. I’ll feed him , change his diaper , Rock him , I’ve tried gas drops and he just will not stop crying. He also grunts a lot .. not sure what’s going on and why itsonly at night ! Last night this went on from 9pm-11pm before he finally fell asleep