Diaper leaking at night HELP

My son is almost 5m old. He is size 2 diaper wears huggies littles ( I switched from pampers but got leaks anyways at night with them too).

Anyways, I have NO problem with leaking in the day.

But at night he sleeps on his stomach and it gets soo full that it leaks. I have to get up and change him and clothes.

It sucks because he usually sleeps through the night. Then it takes him 5 mins of crying until he falls back to sleep. And I cant go back to sleep.

Should I get overnights ? Or a bigger size ? (His penis is pointed down, his diaper is snug around his waist) .

TIA