I sympathise, my 3.5 year old comes into our bed every night, and until a month ago we had our 4 year old and 6 year old in our room on the floor too. We also have the 2 year old in our bed PMSL

We've got the 4 and 6 year olds out of our bedroom from a rewards chart, but the 3.5 wants nothing to do with it. She did sleep through for the first time ever last night though, so maybe seeing her brother and sister getting to go to the movies and getting maccas for lunch is making something tick over in her head haha

Um, I have no ideas though, otherwise I would have gotten mine out of my bed already. But I just wanted to tell you that you're not alone!