Peppito did the same for years and I could not put him in a separate room as my apartment was too small by that time.
Two things that helped: giving plenty of food, as the others said; and use water spray. Peppito is really conditionned to it now: he stops being naughty just by seeing the bottle In the middle of the night it helps calming him from meowing and trying to get us up, but the problem is that aftewards he needs some cuddling to be sure we still love him, so he sits on my partner's chest (7 kg) and starts licking his face and purring like an engine A nightmare!

He is improving with years though. Now he tries to wake us up only in the morning, at 5:00 at the soonest, or 7:00. And most of the time it's because he is hungry.

Jasmine is the opposite: she gives only a very cute "meow?" just after we wake up During the night she plays downstairs alone.