Night sleep changes

My LO, ebf, just recently went from sleeping from 845p to 5a to now sleeping from 845pm to midnight, then up every 2 hrs. Anyone else going through the same thing? He will be 4 months on the 19th.

Last weekend we went on a strip and he slept like normal the whole time we were gone, but now we are home he is back to sleeping like he did at 2 months old. He sleeps in his bassinet no co-sleeping till the 445a feeding. Then he is only there until about 8am, still up every 2 to nurse.

Any thoughts?