Battle with Heaven and Earth

Fang Ning finally managed to build a huge and perfect piece of Vitality Transformation Equipment to satisfy the needs of the gigantic dragon below. 

Oh, he almost forgot that it was actually his body. 

Ah, he was trying to slack off even when he was working for himself, it seemed like there really was no cure for him. 

Fang Ning blinked, then suddenly asked, "Sir System, don't you need to sleep now?"

Sir System replied suspiciously, "What do you mean by that? I'm not like you, I'm always on 24/7 work mode."

 "After you made me build the Vitality Transformation Equipment, I suddenly remembered that once this giant dragon matures, it'd have to go into a deep sleep from time to time. Now when I think about it, it was because they spent too much vitality that they needed sleep to cut down their consumption of the outside world's resources, or else, the ecosystem might not be able to handle it." Fang Ning said thoughtfully.