Please tell me. My son goes to bed at 7-8 pm but wakes up at 5-6 am, a…

Please tell me. My son goes to bed at 7-8 pm but wakes up at 5-6 am, and today he woke up at 4. How can I make him go to bed later? He has a real meltdown if he's not put to bed by 7. I tried pushing everything back until at least 8:30 pm, bathed, went for walks before bedtime, but he still wakes up early. It's also inconvenient that we have a massage at 10 am and he goes to bed at 8:30 am again, so he needs to be woken up. The massage will end. But I don't get enough sleep because of his schedule. And he's