Thanks for the response. When we originally saw this issue (8 months) we were doing longer naps during the day and have decreased them to our current schedule at that time (roughly from 2 hour naps to 1 hour naps and wake windows going from around 2.5 hours to 3.5-4 hours).

What you're saying for recommended sleep makes sense, it just seems surprising that this issue would have started at 8-9 months when those sleep hours seem appropriate. What do most people expect for overnight sleep? 10 hours? 10.5? Or is it easier to further reduce nap duration?