My son had slept in a bassinet and then in a pac and play once he grew out of the bassinet... I put…

My son had slept in a bassinet and then in a pac and play once he grew out of the bassinet... I put his crib up on Sunday and it's been a nightmare. Mind you he used to sleep

For 10 hours straight! Last night he was up every hour and a half to either eat and be put back to sleep. But he's been asleep since 5am and it's now 9:30.. I don't get it! I'm exhausted haven't been this tired since he was a newborn