What's the purpose of the leveled lists ending in "sleep"? According to the "info" these have zero references in game. Are these lists just useless clutter leftover from the game's creation, or do they have some type of purpose? Are they somehow used by the game's scripts?

they are used in region definition to define possible enemies spawned on sleeping

If you want to cross-reference more/different things than CS, give MWEdit uses info/search a try

Ahh, that makes sense. Thanks!