If you want to use Dream Suite to visit an island in New Horizons, you have to ensure that you have the Dream Address for another player’s island. Without a Dream Address you will not be able to travel to any island at all, so either ask your friends for their Dream Address or select one that has been posted on the Animal Crossing: New Horizons subreddit.
When you have a Dream Address, it is time to go sleep and visit Luna in the Dream Suite. To visit a dream island, you are able to select the option ‘I want to dream’ and, after you have been connected to the Internet, please input the Dream Address for the island you want to visit. Then, Luna will tell you the name of the island that you have submitted the code for and, if that is correct, select ‘Yes, it is!’
You will find yourself on your bed outside the Residential Services in the dream version of whichever island you have chosen to visit. Now, you are free to explore the island and talk to its residents all without causing an unnecessary destruction. Even, you are able to find other players, have a small chat with them and explore their home. Remember that since you do not have any tools, it means that you can only fully explore the island if the player has built enough inclines and bridges. If they have not, then those parts of the island will remain inaccessible to you. Finally, you will also have access to the Custom Design Portal that belongs to that island’s owner. Here you will be able to browse their available designs and copy any that you might like.
If you want to have other players visit your island using Dream Suite in New Horizons, you have to make your own dream address. Before you make a Dream Address, it is important to note that by creating and sharing a Dream Address you are allowing everything on your island to be made public. This includes the look of your island, custom designs, your name, rooms in your house, passport information and bulletin-board posts, among other things. If you are not comfortable with any of this information being shared with other people, including the strangers, we highly recommend not creating or sharing your Dream Address with other players.
When you are ready to create a Dream Address, Luna is going to connect to the Internet and make a copy of your island. After she has finished, she will tell you what your Dream Address is, that will start with DA and contain 12 digits. You are able to find your Dream Address on both your Passport and your island map. But, Luna will remove your Dream Address from both of these if you ask her to.
Now, you are able to share this address with other New Horizons players either amongst your circle of friends or on the Animal Crossing: New Horizons subreddit. Remember that the dream version of your island will only reflect what your island looked like on the day you dreamt it. If you change anything on your island and want it to be represented in your dream, you need to return to Luna so she will update your dream. Luna will update the dream version of your island once per day.