White noise and separate them by bookshelves etc. Blackout curtains.

I typically put new kids in my kitchen area until they get used to my schedule and have been sleep trained. Then they move out into the bigger room with the other kids. I remind everyone before bedtime that if they wake up there is no noise. If they make noise I go over, plop them on their bellies and shush them. They typically fall in line after a few weeks.

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