Games like In Dark Sleep
Games like In Dark Sleep include Ready or Not, Outlast, BioShock Infinite, VLADiK BRUTAL, and DOOM Eternal. We matched them by the tags players give In Dark Sleep on Steam (Action, Adventure, Puzzle, Walking Simulator, and FPS): closest matches first, and among equally close ones the better-known games.

Ready or Not
Shared: FPS · Realistic · Action

Outlast
Shared: First-Person · Atmospheric · Adventure

BioShock Infinite
Shared: Action · FPS · First-Person

VLADiK BRUTAL
Shared: Action · FPS · Adventure

DOOM Eternal
Shared: Action · FPS · Gore

Half-Life 2
Shared: Action · FPS · Adventure

Resident Evil Requiem
Shared: Action · FPS · First-Person

Poppy Playtime
Shared: Puzzle · First-Person · Adventure

Resident Evil 7 Biohazard
Shared: First-Person · Action · Atmospheric

Scorn
Shared: Puzzle · Atmospheric · First-Person

Atomic Heart
Shared: Adventure · Action · FPS

Resident Evil Village
Shared: Action · First-Person · FPS

RoboCop: Rogue City
Shared: Action · FPS · First-Person

Buckshot Roulette
Shared: First-Person · Dark · 3D

Amnesia: The Dark Descent
Shared: Puzzle · First-Person · Atmospheric

Call of Duty®
Shared: Action · FPS · First-Person

Black Mesa
Shared: Action · FPS · First-Person

Metro Exodus
Shared: FPS · Action · Atmospheric

What Remains of Edith Finch
Shared: Walking Simulator · Adventure · Atmospheric

Insurgency: Sandstorm
Shared: FPS · Action · Realistic

Far Cry 3
Shared: Action · Adventure · FPS

METRO 2033 Redux
Shared: FPS · Action · Atmospheric

Bulletstorm: Full Clip Edition
Shared: Action · Adventure · FPS

Hail to the Rainbow
Shared: Action · Adventure · Puzzle