The signs when they're tired:
Aries: Tells everyone to shut up so they can nap
Taurus: Falls asleep on the spot
Gemini: Stares blankly while you try to talk to them
Cancer: Does everything slowly and half-assed
Leo: Tries to stay awake and gets grumpy
Virgo: Complains
Libra: Does something to stay awake
Scorpio: Falls asleep mid sentence
Sagittarius: Whines and gives up
Capricorn: Gets cranky
Aquarius: Confused about everything and droopy eyed
Pisces: Leaves and ignores everyone