If an Aries doesn't get everything done during the day, they'll spend their time wisely at night. If they are parents, their ability to stay up late will come in very handy.
Taurus values sleep and makes effort to get plenty of it. The finest bedding and linens will be given, along with a comfortable temperature and, if necessary, white noise machines.
One of the reasons Scorpios are such chronic late-nighters is because science has shown that those who do so tend to be very bright.
Pisces, even if they aren't artists, are overflowing with imagination, and they tend to have their best ideas late at night.
Sagittarians tend to be night owls, although they might try to change. Perhaps the lack of regular sleep patterns is due to the fact that people often have to adjust their routines when they travel or start a new job.
Geminis are known for their erratic sleep schedules, which often include either an extremely late bedtime or an extremely early rise time.
A Virgo is the last sign to forget about all the responsibilities they have. Instead of taking a step back and realizing that it's impossible to achieve everything, they dwell on it.