Sleepless
Inspired by "The Russian Sleep Experiment," this co-op multiplayer horror game challenges players to collect crucial evidence from past experiments. Work together to control the gas, evade the roaming monster, and uncover the terrifying truth.
Last Updated: 10/29/2025
| Steam Price | $5.99 |
| Release Date | 10/18/2025 |
| Developers | |
| Publisher | Mental Studios |
| Steam App Id | 1798570 |
Sleepless
Inspired by "The Russian Sleep Experiment," this co-op multiplayer horror game challenges players to collect crucial evidence from past experiments. Work together to control the gas, evade the roaming monster, and uncover the terrifying truth.
Last Updated: 10/29/2025
- Windows
- Mac
- Linux
About Sleepless
Sleepless is an Action, Indie, and Adventure game developed by CaRuFy, Mental Studios, and Nagodo. On 10/18/2025, it was released on the Steam Store by Mental Studios.
It can be played and ran on Windows systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
It also supports 6 languanges in-game including English, French, German, Spanish (Spain), and Danish. Each language comes with varying levels of support for the in-game interface, audio, and fully translated subtitles.
According to Steam’s category system, Sleepless supports the following features:
- Steam Cloud
- Co-op
- Multi-player
- Steam Achievements
- Single-player
- Family Sharing
- Online Co-op
From the Steam community, Sleepless has been tagged with the following user tags:
- Exploration
- Survival Horror
- Lore-Rich
- World War II
- Multiplayer
- Investigation
- Historical
- Realistic
- 3D
- First-Person
- Cold War
- Psychological Horror
- Action-Adventure
- Horror
- Survival
- Hidden Object
- Thriller
- Online Co-Op
- Action
- Adventure
Media & Sceenshots
Watch the featured video for Sleepless and see the latest screenshots from the Steam Store.
Related Packages
Sleepless is referenced by 1 package in the Steam Store. A package (or sub) is simply an item that can be purchased on Steam.
Supported Languages and Localizations
Sleepless is available in 6 different languages with varying levels of support for the in-game interface, audio, and fully translated subtitles.
| Name | Interface | Audio | Subtitles |
|---|---|---|---|
| English | Yes | No | No |
| French | Yes | No | No |
| German | Yes | No | No |
| Spanish (Spain) | Yes | No | No |
| Danish | Yes | No | No |
| Russian | Yes | No | No |
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Features & Categories
Frequently Asked Questions
Soures & References
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Sleepless data has been sourced from:
- Valve Corporation. (2025, October 29). Sleepless on Steam. Steam Store.
- Valve Corporation. (2025, October 29). Sleepless. Steam Community Hub.