As your sister/sister-in-law what she does with regards to her bedtime routine and emulate it. I'm guessing she has an established routine before bedtime and a strict LIGHTS OUT policy with a procedure for getting up and going to the bathroom and then right back to bed. I'd wager that your daughter saw that her cousins followed it and modeled off them.

Also - if I may be so bold - the co-sleeping thing is something you need to fade out from. Your daughter expects you to be in bed with her and you have become her living, breathing teddy bear; she's dependent upon you. Don't be surprised if she is able to manipulate you.

I'm not judging; my son did the same exact thing with us and it was EXHAUSTING. I can't say that we extinguished it successfully. If he woke up alone he would pull all the stops to draw us back into his room. He is 15 and it's still an issue from time to time.

For my daughter, we found she needed white noise. We tried a sound machine but it was a fan on medium that worked best. She is now 12 and goes to bed very well. It will get better. keep trying different things. Maybe offer a treat with breakfast if she can go to bed and rest quietly.

My son is 4, and he often tries to sleep with me. Whenever he comes in our room, I redirect him. I had to let him cry awhile, but eventually he learned that he had to stay in his room. It's an ongoing battle, but i make sure that he knows that he has to sleep in his own bed.

None of mine ever slept through the night and they rarely stayed with someone else. But, when they did, they often slept better. I don't get it. But, then again, I never sent them away if they came to my bed. In retrospect, I might have done things differently. Not that I don't believe in attachment parenting, but learning to sleep at night is so important for their health. We pay the price with vitamin D deficiency.

My daughter is moderate functioning with ASD/ADHD. She used to not like me listening to CBS Radio Mystery Theater but now she does sometimes. I have insomnia and it's the only thing that really helps.

https://www.cbsrmt.com/