Im surprised that my face is more clearer in weekends than it's in the week. In weekends I sleep about 9 or 10 hours per night. 1am-10 or 11am. And in the week I sleep from 10-30pm to 6:30am...

Why does that surprise you? The more sleep you get the more your body can heal itself. You're also probably more relaxed on the weekend so that also helps. When I didn't have work for a couple weeks and got to sleep in nearly everyday my skin cleared up 100%, but once I went back to work and waking up at 5am again I broke out.