I got the similar problem. My duaghter (32 months old) start sleeping at her own room with 工人 one week before. But she always wake up at the mid-night and ask to back to our room. This made us including 工人 so tired to wake up at midnight everynight.
What can I do?? How can I train her to sleep at her own room (as she sleep at our room previously)?? The funny thing is she would not wake up at mid-night when sleeping with us!!! ?-( ?-(