Homesick

Homesick is a first-person 3D puzzle exploration mystery game. You will explore an abandoned building, encountering puzzles and clues as the story unfolds.

You seem to have been there so long that direct sunlight is blindingly bright. But when you sleep, you are plagued by nightmares, frantically running down hallways chased by darkness. You need to find the remnants of the building's inhabitants to discover who you are, what happened, and what you need to do, as you try to escape in both your nightmares and the waking world.