9-12 hours: Taurus, Leo, Pisces

5-8 hours: Scorpio, Capricorn, Libra

1-4 hours: Virgo, Aquarius, Gemini

All nighters: Sagittarius, Aries, Cancer

I'm actually between the 5-8 or 1-4. I don't stay up all night, because sleeping is actually an essential part to live, I just have troubles with it.