I felt down, after a 1h 25mins nap, he yawned 16:30, I thought it's not sleep cues, just hungry or others, but when he took his formula at 18:40, he ate not well, I thought he was OT

. BT 19:00. short cry around 22:30, seems sign of ot,He woke 3 am, yawns many times, upset, till now, 5:00am, he seems finally asleep now, poor baby.
so yesterday better night was more like a crashed night? 20mins later BT made so much difference?
My intuition still is massive accumulated OT, I did many wrong things to him since his sleep cues never be obvious since he was 6 month. I ever tried three CN for days, only becuse I thought a crashed day was he needed.

his A looks much shorter than his age now,like 6 months? I found even after a restorative nap, he can easily falls asleep in car 2.5 or 3hrs later.
what should I do today? early BT didn't work. he just woke 11 hrs later. looks like his total sleep need is 13h15min, little change from 6 months, but his A is short, cann't reach BT with normal day sleep.
I hope I am wrong for accumulated OT, but if it's true, is any way to let him recover? I even thought I may lost him just now,the long nw lasted two months. he was also clingy this week,