https://www.eurogamer.net/animal-crossing-new-horizons-slumber-island
How to unlock and use Slumber Islands in Animal Crossing: New Horizons | Eurogamer.net
How to unlock Slumber Islands and learn how to set up, edit, save and invite friends to Slumber Islands in Animal Crossing: New Horizons.
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https://www.gamespot.com/articles/how-to-use-slumber-islands-in-animal-crossing-new-horizons/1100-6537463/
How To Use Slumber Islands In Animal Crossing: New Horizons - GameSpot
The latest update lets you unlock and customize new islands, and you can even co-op them with friends.
animal crossing newuseslumber