18 month old early morning wakes

[Bailey123x]

I’d love some help/advice!
18 month old has started sleeping through but is wide awake by 5/5.30 and I don’t understand. It used to be between 6.30/7. We have tried earlier bedtime, later bedtime, too not to hot, not too cold, one nap, gone back to two, everything! He now is struggling to make it to his nap from being awake so early!

His schedule roughly was
Wake 6.30/7
Nap 11.30/1 or 12/1.30
Asleep for 7/7.15

How long is the nap?

Does he eat before bed? If my DD doesn’t eat enough in the evening she wakes up super early.

Sometimes a hour sometimes 2 hours. The nap time doesn’t even make a difference!

Last night I actually tried dinner at 5.30 instead of 5 and he still woke this morning early! He hasn’t been eating as much for dinner as think his teeth are sore!

any light getting into the room? we are almost at the longest day with sunrise still getting earlier and earlier, currently around 5am. some kids are light sensitive and light coming in at this time, when their sleep pressure is lowest, triggers them to get up for the day