Such titles are typical of the Japanese indie voice acting scene, frequently available on digital platforms like DLsite (using the RJ number for searching).
Upon launching RJ01324, the user is greeted not with a bombastic menu, but likely with the ambient sounds of a railway station. The "gameplay" involves the user interacting with the environment to optimize the conditions for sleep.
The soundscapes are designed to be seamless, preventing any sudden auditory breaks that might wake a sleeping user.