hmm this is a hard question because on one hand i think tsukasa definetly has earliest bedtime (that guy is under the covers at 10pm sharp) but also i wrote a fic where he falls asleep last because he keeps thinking about wxs... (he is patheticaly in love with them lol)
still i think he definetly tries to make them all go to sleep early but emu is jumping around (he shouldnt have let her eat all that candy dammit!!!) rui is teasing him, probably doing something stupid. and nene is just watching it all unfold. speaking of—i could totally see nene fall asleep first as well. well...try to that is :3