Games like Sleepless
Games like Sleepless include Escape the Backrooms, Dead by Daylight, Backrooms: Escape Together, Phasmophobia, and The Outlast Trials. We matched them by the tags players give Sleepless on Steam (Psychological Horror, Horror, Survival Horror, Survival, and Thriller): closest matches first, and among equally close ones the better-known games.

Escape the Backrooms
Shared: Horror · Psychological Horror · Multiplayer

Dead by Daylight
Shared: Horror · Survival Horror · Multiplayer

Backrooms: Escape Together
Shared: Horror · Psychological Horror · Multiplayer

Phasmophobia
Shared: Horror · Psychological Horror · Multiplayer

The Outlast Trials
Shared: Horror · Psychological Horror · Survival Horror

Outlast
Shared: Horror · Survival Horror · Psychological Horror

Pacify
Shared: Horror · Psychological Horror · Survival Horror

DEVOUR
Shared: Horror · Survival Horror · Psychological Horror

Lethal Company
Shared: Horror · Survival Horror · Online Co-Op

Subnautica 2
Shared: Horror · Survival · Multiplayer

Inside the Backrooms
Shared: Horror · Survival Horror · Psychological Horror

Dying Light
Shared: Horror · Survival Horror · Online Co-Op

Sons Of The Forest
Shared: Survival · Survival Horror · Multiplayer

R.E.P.O.
Shared: Horror · Multiplayer · Online Co-Op

PANICORE
Shared: Horror · Psychological Horror · Survival Horror

The Forest
Shared: Horror · Survival · Survival Horror

The Beast Inside
Shared: Horror · Survival Horror · Psychological Horror

Content Warning
Shared: Horror · Online Co-Op · Multiplayer

Poppy Playtime
Shared: Horror · Survival Horror · Psychological Horror

Outlast 2
Shared: Psychological Horror · Horror · Survival Horror

In Silence
Shared: Horror · Survival Horror · Psychological Horror

Nuclear Nightmare
Shared: Horror · Survival Horror · Psychological Horror

Left 4 Dead 2
Shared: Multiplayer · Horror · Survival

Dark Deception
Shared: Horror · Psychological Horror · Multiplayer