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Sleep Outbreak
An online co-op horror game for 1-4 players. The Sleep has fallen upon the region. Every one has fallen asleep while dangerous Moribo and Day-Night Terrors roam. Extract materials and save Moribos before the environment turns hostile at night. Fail to extract and your gear are lost to the dark.

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Features
Single-player
Online Co-op
Family Sharing
Steam is learning about this game 
Languages:
Interface Full Audio Subtitles
English ✔ ✔ ✔
Content
Includes Interactive Elements

In-game chat

Coming Soon To Early Access

The developers of this game intend to release as a work in progress, developing with the feedback of players.

Note: Games in Early Access are not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“Early Access is a good way to get feedback from players and ship better content for the game quickly. ”

Approximately how long will this game be in Early Access?

“We plan for the game to be in Early Access for about a year. ”

How is the full version planned to differ from the Early Access version?

“We plan to add more maps, monsters, items, weather events, and abilities. ”

What is the current state of the Early Access version?

“There are currently 3 maps with 20 monsters.”

Will the game be priced differently during and after Early Access?

“We plan to gradually raise the price after Full version release with more content and features shipped. This will allow us to develop the game further. ”

How are you planning on involving the Community in your development process?

“We plan to involve the community by asking for feedback in our Steam community and forums, as well as on our Discord server. We will seek feedback regarding upcoming planned features, balance, difficulty and bug reporting. ”
Read more
This game is not yet available on Steam

Planned Release Date: Apr 2, 2026

This game plans to unlock in approximately 2 months

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About This Game

Sleep Outbreak is an online co-op multiplayer game about entering The Sleep and surviving to extract loot and save   Moribos.

  • Difficulty increase and chance of rare Moribos and loot as you survive more days in The Sleep. 

  • Day and night cycle, Dynamic weather. Multiple maps.  Moribos appear at different times in different environments. 

  • Proximity chat - communicate with your friends. 

  • Use stealth and items to avoid hostile monsters. 

System Requirements

    Minimum:
    • OS: Windows 10
    • Processor: 2.7 GHz Dual Core (and above, can run on single core)
    • Memory: 2 GB RAM
    • Graphics: Direct3D, OpenGL
    • Storage: 3 GB available space
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