Sleepless: Survive the Russian Sleep Experiment in this Multiplayer Horror

7/18/2026, 2:02:15 AM

Release date: 10/18/2025

Tags: #psychological-horror #horror #survival-horror #survival #thriller #multiplayer #online-co-op #action

User Reviews

Score: 64%Mixed
Review Count: 14 reviews
Fetched At: 8/29/2026, 10:37:36 AM

Reference prices

Japan

¥ 700 (JPY)

Steam JP

$5.99 (USD)

Steam Global

Live Store Snapshot

Body text may reflect the state at publication time. For the latest sale, price, and review changes, prioritize the live price panel, review panel, and the Steam store listing.

Japan Price: ¥ 700
Global Price: $5.99
Price in Your Region: ¥ 700Prices as Steam lists them per country. What you are actually charged depends on your Steam account settings.Regional prices checked: 30 Aug 2026
Sale Status: Regular pricing
Price Checked At: 8/28/2026, 8:20:14 PM

Key highlight

Sleepless is a multiplayer horror game inspired by the Russian Sleep Experiment. Players must collect evidence and distract a blind monster in a dark Russian bunker. Released October 18, 2025.

Who this is for

If you're intrigued by the unique theme of the Russian Sleep Experiment and the cooperative challenge of facing horror with friends, Sleepless is a recommended title. The survival experience within a bunker filled with darkness and the constant threat of a monster is sure to be memorable.

🖥️ Hardware Guide for Comfortable Play

Based on the game's recommended specs, showing a comfortable performance target and example parts (PassMark reference)

💻

CPU

Game's recommended spec

Intel i7 / AMD equivalent

No PassMark data — please check the manufacturer's site

🎴

GPU

Game's recommended spec

NVIDIA GTX 970 / AMD Radeon R9 290

Comfortable play target

12,524 pts(~130% above spec of 9,634 pts)

Parts near this range

GeForce GTX TITAN X12,512 pts Intel Arc Pro B5012,577 pts GeForce RTX 3050 8GB12,468 pts

* Scores are reference values. Actual performance varies by in-game settings, resolution, and system environment.

Build a PC to match this performance → BTO Guide

Details

Overview

Prepare for a chilling descent into madness with Sleepless, a multiplayer horror experience developed by CaRuFy and Nagodo, and published by Mental Studios. Inspired by the infamous "Russian Sleep Experiment" myth, this game plunges players into a dark, present-day Russian bunker. The atmosphere is thick with dread as you and your teammates attempt to uncover the secrets of past experiments.

Highlights

Multiplayer Survival Horror: Team up with friends in online co-op to navigate the treacherous bunker and evade a terrifying, blind monster.
Thematic Inspiration: Draws heavily from the "Russian Sleep Experiment" myth, offering a unique and unsettling narrative.
Dynamic Gameplay: Players must collect evidence, manage scarce resources like electricity, and strategically distract the relentless monster to survive.

Who It's For

Sleepless is designed for players who enjoy psychological horror, survival challenges, and cooperative gameplay. If you're looking for a tense, atmospheric experience that requires teamwork and quick thinking to overcome a terrifying threat, this game is for you. Fans of narrative-driven horror and unique experimental concepts will also find much to appreciate.

Game Info

Released on October 18, 2025, Sleepless falls into the Action, Adventure, and Indie genres, with strong elements of Psychological Horror and Survival Horror. It supports single-player and multiplayer modes, including online co-op. The game is available in English, French, German, Spanish, Danish, and Russian.