For about 3-4 months now our daughter who is 2 and a half keeps waking in the night and coming into us and we walk her back to bed but have to wait for her to fall asleep before we can leave the room otherwise she screams. This can be upto 5 times a night and is very tiring. She never says why she wakes. How do we get her to just get herself back to sleep if she wakes up and not come into us. She has always been a good sleeper until this last 3-4 month period. Never used to wake up and never came into us so what has changed and how can we get her back to not waking and needing us