My Puppy Keeps Screaming In His Crate….?

My puppy is about 9 weeks old and I’ve been crate training him and his is so smart! On the 2nd day he slept through the whole night and his has never had an accident in his crate. He sleeps in a seperate room next to my other dog and she is in her crate. Right before putting him inside I take him out to pee and put him inside with a tiny little treat. I have always done this with my other dog too. But today (its 4:44am right now….) he started barking really loud it really scared me so I took him out of his cage and took him out to pee and put him right back in. He has never ever screamed like that ever. This happened 3 more times, anyone know why he is acting like this? Its a boy Cockapoo, 9 weeks, just about perfectly house trained.