Does not work with meiling, komachi, or kaguya (because they just sleep the whole time), and tenshi (neglect play) yukkuri.
Another possibility: Even if asleep, they'd still need food to stay alive; when the Kaguyas woke up to feed there wouldn't be anything to eat and they'd die in their sleep (it just wouldn't be that entertaining). Of course, if something comes out where it does work, it does. Otherwise, it's opinion and personal preference as to where it does and doesn't work. Nothing is fixed...
Dornob - Awww. If it makes you feel better, the Reimu in this cartoon was a stunt yukkuri!
harouki - You know, I get bored pretty fast with Anons. That's why I pretty much cribbed Ayazou's black-and-white Anon style.
Skribulous - I don't think I could ever draw a Meiling in a situation like that-- I'd feel too guilty! (Kaguyas drive me a bit nuts, though-- it's the expression. Maybe put one in a jar that's been hooked up to a high-bass sound system...?)
Cnaiur urs Skiotha - I think I'll let someone else tackle that one....
Tea - Sleep deprivation experiments on smugface Kaguyas? That might be fun!