Sleep late, make it worse, because learning to relax is not sufficient to make it worse to learn meditation. Recognition and understanding of memory and there is less creativity. If the sleep sleep sleep that late that will cause a memory disorder.
Sleep makes it worse because the study is not enough to make it worse concentrate on studying perception, understanding, memory and creativity diminished. If you sleep late, sleep. It causes memory loss.
Sleep late make learning worse because of insufficient rest will make concentration worse, perception, understanding, memory and having creative decrease. If you sleep late sleep will cause dementia.