By sleeping at 3 am, you can reduce the amount of time spent in contact with other people as no one in their right mind would stay awake for such an excessive amount of time at night. Thus a perfect choice for loners who might even prefer a completely nocturnal sleep pattern.

In a bad mood? Blame it on your lack of sleep. Lack of sleep is the holy grail of excuses as it is an actual excuse. You can't blame a kid for falling asleep in cla.s.s if he couldn't sleep at home.

All those advantages are just pure bulls.h.i.+t. If you haven't realized yet, there are no advantages worthy enough to mess up your sleep schedule. (Except maybe working night s.h.i.+fts if you really need the extra cash)