I have a 3 month old but he wakes up every 3 hours to eat during night but stays awake at least an hour

He then wakes up at 6am and I feed him and everything but he stays awake until mid-day and it affecting me because I can’t get any sleep at least once during the day or even at night

He used to sleep through the night but that suddenly just changed

I don’t really know what to do

He takes a bath but that doesn’t really help anymore

I play with him so he can get tired but that also doesn’t help

I haven’t slept in two days already I need advice