Games like My Sleeping Girlfriend
Games like My Sleeping Girlfriend include Mouthwashing, SOMA, Poppy Playtime, Firewatch, and MiSide. We matched them by the tags players give My Sleeping Girlfriend on Steam (Horror, Psychological Horror, Thriller, Walking Simulator, and Survival Horror): closest matches first, and among equally close ones the better-known games.

Mouthwashing
Shared: Horror · Psychological Horror · Story Rich

SOMA
Shared: Horror · Psychological Horror · Story Rich

Poppy Playtime
Shared: Horror · Psychological Horror · Survival Horror

Firewatch
Shared: Adventure · Walking Simulator · Story Rich

MiSide
Shared: Psychological Horror · Horror · Story Rich

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

Amnesia: A Machine For Pigs
Shared: Horror · Walking Simulator · Psychological Horror

What Remains of Edith Finch
Shared: Walking Simulator · Story Rich · Adventure

Layers of Fear (2016)
Shared: Horror · Psychological Horror · Walking Simulator

Five Nights at Freddy's: Security Breach
Shared: Horror · Survival Horror · First-Person

Outlast
Shared: Horror · Psychological Horror · Survival Horror

Lethal Company
Shared: Horror · Survival Horror · Psychological Horror

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

Visage
Shared: Horror · Psychological Horror · Survival Horror

The Beast Inside
Shared: Horror · Adventure · Survival Horror

Still Wakes the Deep
Shared: Horror · Psychological Horror · Walking Simulator

Outlast 2
Shared: Horror · Psychological Horror · Survival Horror

Garten of Banban
Shared: Horror · Psychological Horror · First-Person

Fears to Fathom - Ironbark Lookout
Shared: Horror · Psychological Horror · Thriller

Blair Witch
Shared: Horror · Psychological Horror · Adventure

Fears to Fathom - Norwood Hitchhike
Shared: Horror · Psychological Horror · Thriller

No, I'm not a Human
Shared: Horror · Psychological Horror · Story Rich

SILENT HILL 2
Shared: Horror · Psychological Horror · Survival Horror

Resident Evil 7 Biohazard
Shared: Horror · Survival Horror · First-Person