BB starts to have separation anxiety. She will wake up at midnight. If she cannot see you, she will cry a lot. You just need to appear to her immediately and touch her or swipe her back, talk to her, sing a song, whatever you do that can let her know you are stay with her. She will fall to sleep again. I was acknowledged by the following website. My son now is 11 months. He also wake up at the midnight some times.