One idea for a possible game: You're the Sandman. While you move in the orbit with the sunset around a planet, you have to throw sand on the cities below you to put the inhabitants to sleep. In the background you hear a lullaby.

Send all the people to sleep, who want to sleep! If you see or hear them celebrating a festival, they want to stay awake. There are also gypsies on the planet who sleep every night in another place. The sound of their music and their campfires guide you to them. A storm with clouds can obstruct your view and you have to remember where a city was.

If the inhabitants of a city don't sleep for several nights, they become zombies. The less zombies you have on your planet after a month (about 4 real minutes), the more points you receive. I must confess the zombies would be in the game for pure marketing reasons.

----------------------------------------------------
Reading: The Sandman: Preludes and Nocturnes by Neil Gaiman
Watching: Dawn of the Living Dead (1978)
Listening: S'NIX by Hubert Von Goisern
Surfing: Zombies on the web
Playing: Sandman Vs Zombies (In my mind)