people say birds can't cry but i beg to differ mine cries at night for some reason, not saying he sheds tears but he cries in his little voice, it's sad cuz i don't know why
It could be some night time chattering before he sleeps, my birds do that regularly. If the lights are still on I hear them make this sweet tiny noise before I hear beak grinding. It could also be that or he's trying to mimic what he has heard.
Do you have a video of him crying?