5 month old sleep

My son recently turned 5 months and his sleep completely changed. He was only waking once or twice a night finally and was so easy to put down, he’d go right back to sleep! Now it takes multiple times of us picking him up to get him to sleep and he won’t sleep longer than 1-2 hours. He’s in his crib with white noise, blackout. Nothing’s changed. Anyone else have thoughts or going through this?? I understand leap 5 starts around now but this seems very extreme.