Night waking every hour :(

Lucy

4-month old wakes every hour after 10pm until I end up getting up with him at 5am cause he wont go back to sleep. 4 month sleep regression? Growth spurt? Please someone tell me itll pass... he's never been a good sleeper but we did have 1 - 2 weeks of bliss prior to this when he was only waking twice between 7pm and 6am