Are you tired of struggling to reshape your main island because of limitations, inventory headaches, or the fear of ruining days of progress? Animal Crossing: New Horizons Version 3.0.0 brings the creative freedom you’ve been dreaming of — literally. Slumber Islands are a brand‑new feature that lets you build, terraform, and decorate in a sandbox environment completely separate from your main island — solo or with friends.
In this definitive guide, you’ll learn how to unlock Slumber Islands, what you can and can’t do there, how multiplayer works, and pro tips to inspire your best designs yet.
๐ค What Are Slumber Islands?
Slumber Islands are dynamic creative spaces unlocked in the Version 3.0.0 update. Think of them as a true creative mode where you can:
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Place any item you’ve cataloged without crafting costs
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Terraform freely, including cliffs, rivers, and waterfalls
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Change time of day and weather
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Build with up to 7 friends in real‑time (standard Switch) or up to 11 (Switch 2 Edition)
These aren’t the old Dream Islands — which are static snapshots of other players’ islands. Slumber Islands are editable, collaborative spaces designed specifically for experimentation and creative play.
๐ชฉ How to Unlock and Access Slumber Islands
Before you can start building your dream space, you need to:
✅ 1. Update to Version 3.0.0
Make sure your game is updated to the latest Version 3.0.0 or higher.
✅ 2. Have Nintendo Switch Online
Slumber Islands require an active Nintendo Switch Online membership, even in single‑player use.
✅ 3. Receive Luna’s Letter
After updating, check your in‑game mailbox for a letter from Luna inviting you to Slumber Islands. If you don’t see it immediately, try loading your island on the next in‑game day — some players report a delay.
✅ 4. Sleep & Choose “It’s Slumber Time!”
Lie down in any bed and you’ll see a new option: “It’s slumber time!” Select it to start creating your Slumber Island.
๐ Choosing Your Slumber Island
When you first enter, you’ll get to choose:
| Size | Best For | Notes |
|---|---|---|
| Small | Solo builds or quick themes | Cozier space, easier to finish |
| Medium | Most balanced for collaboration | Good for joint projects |
| Large | Ambitious builds | Best for elaborate designs or big groups |
You can create and save up to three separate Slumber Islands per player profile, each with its own layout and theme.
๐จ What You Can Do on Slumber Islands
Once inside your creative paradise, your tools are almost limitless:
๐ ️ Free Decorating & Terraforming
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Place furniture and items from your catalog instantly — no crafting required
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Terraform the landscape with cliffs, waterfalls, and rivers
☀️ Customize Time & Weather
Set time of day and weather to suit your theme — perfect for atmospheric builds.
๐ณ Plant Trees & Flowers at Any Stage
Slumber Islands let you place and grow trees, flowers, and shrubs exactly where you want them.
๐งฑ Build Bridges & Inclines
Talk to Lloid on the pier — and bridges/inclines place instantly without Bells or construction delays.
๐ง๐ค๐ง Multiplayer Design
Invite friends to collaborate in real‑time:
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As Host, generate a Doze Code to share
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Visitors can terraform, place items, and decorate just like you
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Player limits: up to 7 visitors on Switch, up to 11 on Switch 2 Edition
⚠️ What You Can’t Do on Slumber Islands
Despite the freedom, some restrictions still apply:
๐ซ No Permanent Buildings
Other than your own house, you can’t place:
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Shops
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Resident Services
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Villager homes
These islands are creative sandboxes, not new towns.
❄️ Season Locked
The season always matches your main island — no independent seasonal changes.
๐ญ Villagers Are Decorative Only
You can add your villagers, but they’ll only walk and wave — no dialogue or gameplay interactions.
❌ No Amiibo Support There
Amiibo invitations don’t work on Slumber Islands, and villagers can’t be given homes there.
๐จ Custom Design Limitations
To use custom designs:
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Download them into your main island first
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Then transfer them to your Slumber Island
This can eat up design slots quickly, so prepare ahead.
๐ฏ Multiplayer: Invite Friends & Collaborate
Slumber Islands are the first ACNH space where multiple players can edit the same island simultaneously.
๐ข How Multiplayer Works
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Host a session using a Doze Code — similar to Dodo Codes
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Friends join via their own consoles and internet connection
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Visitors can build, terraform, and decorate just like the host
๐ฅ Player Limits
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Up to 7 visitors on original Nintendo Switch
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Up to 11 visitors on Nintendo Switch 2 Edition (total 12 with host)
Local split‑screen is not supported — everyone needs a separate Switch and NSO subscription.
๐ Pro Tips for Master Builders
๐ง Bring a Well‑Stocked Catalog
Before jumping into Slumber Islands, make sure you’ve unlocked and cataloged as many items and DIYs as possible — that’s what you’ll be decorating with.
๐ญ Plan & Reuse Designs
Since custom design slots are shared with your main island, plan which designs you want dedicated to Slumber Island before transferring.
๐️ Use It as a Planning Tool
Slumber Islands are perfect for:
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Testing large builds without risk
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Planning seasonal layouts
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Coordinating multiplayer projects
This turns design frustration into creative play.
๐ง Community Insights & Troubleshooting
❓ Not Seeing “Slumber Time”?
Some players report the feature doesn’t appear instantly after updating. Try:
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Logging in on the next in‑game day
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Checking your mailbox for Luna’s letter
This seems to unlock the option.
๐งฉ NSO Required for Access
Even in single player, Nintendo Switch Online membership is required to use Slumber Islands, so ensure your subscription is active.
๐ Final Thoughts
Slumber Islands in Animal Crossing: New Horizons 3.0.0 are the most ambitious creative feature the game has ever seen. They turn decorating from a chore into a playground — a place to experiment, build with friends, and imagine island designs you never thought possible.
Whether you’re crafting a festival square, testing a themed layout, or hosting a collaborative build session, Slumber Islands offer a new frontier of creativity.
๐ฌ Have you designed your first Slumber Island yet? Drop your themes and Doze Codes in the comments to inspire others!
๐ฑ Community & Resource Links (ACNH 3.0.0)
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