Our daughter has been an independent sleeper (at long last!) for the past 1.5 months and STTN. She has recently has learned to crawl, sit up, and even took her first steps. She is also currently teething and has a cold (so much going on at once!) Last night, she kept sitting up when I put her down to sleep, even though she was drowsy, yawning, rubbing her eyes and settled, she would pop up. Each time I would lay her back down and then she would sit up again. Then, she woke up at 3 am and did it all over again. When I tried to leave the room if she was settled, she would start crying hysterically. I am assuming this is a combination of separation anxiety and developmental milestones. PU/PD has never been successful with her in the past and just makes her more angry. We have done a modified version of sshhh/pat without the patting and it has worked well in the past, but currently she cries any time my hand is moved off of her and she wakes up, so I think that it may become a prop if I carry on with it. Could anyone give advice about how to help her? Would walk-in/walk-out be a good solution? Any advice would be greatly appreciated.