Anyone else’s 3 month old’s sleep starting to change?

Ar

I’m finally noticing longer naps (1-2 hours instead of 30-45 minutes) and the last few nights he is ready for bed around 7pm and we usually do bedtime around 8:30. I did go back to work 2.5 weeks ago and I’m wondering if that has anything to do with it. Or maybe it’s his 3 month growth spurt. Idk. I’m wondering if I should just start putting him to bed around 7/7:30 now. Anyone else in the same boat?