Tsukihime---> Akiha, Satsuki, Kohaku
Angel Beats!----> Yui
Koihime Musou----> Bansho, Shion
Sora No Otoshimono----> Ikaros, Kazane
Vandread----> Dita
Kampfer----> Shizuku
and many more, but so far, they're my Favorites...
Nice advice!!!
Already proven, but not effective for long-term insomniacs wherein the body itself has a reversed sleeping habits...
But that might solve YACHI's problem...