Not sleeping....

Hellp my newborn as soon as nighttime hits gets super fussy and won’t sleep. As soon as I place him in his bassinet for bedtime it’s like a flip switches and he’s up. (After diaper change and a feeding). Nothing seems to soothe him. Now mind u he is asleep and when he hits that bassinet he’s wide awake. He sleeps in his swing and pack n play bassinet and in my arms/chest just fine. I know newborns don’t sleep thru the night but he used to at least go down for a few hours. Now it’s at least 1am.