Games like Sleep Tight
Games like Sleep Tight include Orcs Must Die! 2, Orcs Must Die!, X-Morph: Defense, Sanctum 2, and Freeman: Guerrilla Warfare. We matched them by the tags players give Sleep Tight on Steam (Indie, Action, Strategy, Shooter, and Tower Defense): closest matches first, and among equally close ones the better-known games.

Orcs Must Die! 2
Shared: Action · Tower Defense · Strategy

Orcs Must Die!
Shared: Action · Strategy · Tower Defense

X-Morph: Defense
Shared: Action · Strategy · Indie

Sanctum 2
Shared: Tower Defense · Strategy · Action

Freeman: Guerrilla Warfare
Shared: Action · Strategy · Shooter

GemCraft - Chasing Shadows
Shared: Indie · Strategy · Tower Defense

KovaaK's
Shared: Action · Shooter · Indie

My Friend Pedro
Shared: Indie · Action · Shooter

Sanctum
Shared: Strategy · Tower Defense · Action

ShellShock Live
Shared: Strategy · Action · Shooter

PUBG: BATTLEGROUNDS
Shared: Shooter · Action · Strategy

Rock of Ages
Shared: Indie · Strategy · Action

Infested Planet
Shared: Strategy · Action · Indie

Rock 'N' Roll Defense
Shared: Strategy · Action · Tower Defense

Orcs Must Die! 3
Shared: Strategy · Tower Defense · Action

Thronefall
Shared: Strategy · Tower Defense · Action

Taur
Shared: Action · Strategy · Indie

Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · Action

Rock of Ages 2: Bigger & Boulder™
Shared: Strategy · Action · Indie

Police Stories
Shared: Action · Strategy · Shooter

Let Them Come
Shared: Indie · Action · Tower Defense

Bright Memory: Infinite
Shared: Action · Indie · Shooter

Cluckmech Oasis
Shared: Strategy · Tower Defense · Action

Sang-Froid - Tales of Werewolves
Shared: Strategy · Action · Indie