Why does 9 months old sleep so less and play at midnight?

[duoduo]

My boy is 9 months old, according to internet, babies at his age should sleep:
2 naps, 2~3hours, 11hours at night, so total is 13~14 hours/day
He:
2 naps, 2.5~3.5hours/day,  9.5hours or less at night, total is 12~13 hours or less/day
I know every baby is different, so I am wondering if his total sleep times is normal or my baby does sleep too less?
And his sleep pattern likes a cycle, after couple days with less sleep , he would take a big nap which makes 2 naps up to 4hours, then he wakes up and plays in the midnight for 1.5~2hours, so I am kind of know why he plays at midnight, but what can I do? Should I wake him up from the long nap? And I think the reason he has the long nap is he slept too less before, it got accumulated, if this is the case, I really don’t want to interrupt his sleep, and how come he does not sleep more at night, but at naps?
he is on 3hours and 45 mins ~ 4hours A time cycle, here I posted some of his E.A.S.Y, can anyone please tell me if there is something wrong or should be tweaked?
Day 1
Wake up    7:22
1st nap   11:14 ~ 1:30, A time - 3hours 52mins, nap time - 2hours 16mins
2nd nap   5:25 ~ 6:40, A time - 3hours 55mins, nap time - 1hours 15mins
Nap times   3hours 31mins
Bed time   10:16
Total: 14hours 39mins (in the past 4 days, they were all around 12 hours)

Day 2
Wake up    7:55
1st nap   11:50~2:00, A time was 3hours 55mins, nap time 2hours 10mins, cried @45mins, put down 2 times
2nd nap   5:40~7:00, A time was 3hours 40mins, nap time 1hours 20mins
Nap times   3hours 30mins
Bed time   10:40
Total: 13hours 10mins

Day 3
Wake up    6:40
1st nap   10:25~ 12:40, A time was 3hours 45mins, nap time 2hours 15mins
2nd nap   4:30~6:42, A time was 3hours 50mins, nap time 2hours, cried @45mins, put down 2 times
Nap times   4hours 
Bed time   10:30
Total: 12hours


Day 4
Wake up    8:55, played @1:30 ~2:45 for 1hour 15mins, probably because
yesterday he had 4hours nap
1st nap   12:30 A time was 3hours 35mins, nap time 2hours
2nd nap   6:30~7:30,  A time was 4hours , nap time 1hours
Nap times   3hours 
Bed time   10:40
Total: 12hours 15mins

thanks.

[MasynSpencerElliotte]

Have you ever tried a one nap day? Just wondering if he is a lower sleep needs kid may be ready for the 2-1 switch, maybe even just alternating 1 and 2 nap days depending or capping one of his naps to keep bedtime earlier. Usually the 2-1 would be done gradually by cutting back the morning nap and bringing the second nap earlier.

[duoduo]

yes, I did try to cut his naps from 2 to 1, but couldn't make it, he will wake up from 2nd nap anyway and doesn't want to continue sleeping.

[MasynSpencerElliotte]

What about shortening one nap a lot? That way the day doesn't end up quite so long.

[duoduo]

trying, will come back with result, thank u for advice.