Wake early or go sleep late?

Which one?

It's 2 a.m. and I don't sleep. It's not usual case in my life so I am thinking what is best. To wake early and sleep (die?) after 7 pm.m or wake afternoon and work whole night? I wake up at 5 - 7 a.m. and finish my work at 5-6 p.m. Today I am implementing this blog and I am suprised how nice is working when everybody sleeps.