I moved my 12 month old in with my 3 year old and both wake up about once per night…but they rarely wake each other up. There was an adjustment period and then they seemed to get used to it. But I would imagine every situation is unique. Decide how long a trial period is and stick with it until that ends and then assess if it’s working for you.
My5 year old has her own room and my 16 month old is in his cot in my room. My 5 year old isn’t a great sleeper so it’s not fair them sharing a room yet
We did this…we also had no choice so just bit the bullet and did it. It was not great 🙈 my 5 month old is still waking a few times, so it was a disaster. We had to rearrange our bedroom and fit his cot in with us! we had no choice, it was disturbing my 2 year olds sleep too much, and I had major mum guilt from it :( Goodluck!