Any ideas??

My little girl is 3 months old, many times during the night while she sleeps she starts crying but tonight was nothing like any other night. She started crying(with tears) so loud and so much I have never seen her cry like that. Any one maybe went through this too or has an idea as to why she cries in her sleep like that?

Not to mention it doesn’t have exactly every night. And I did put her in her crib while I was in the living the camera was on and I was watching her through it.