After everything that had happened in Alterian, it was time for Raze to return to the world of Pagna. He had spent far less time than he had expected in the other world, thinking it would take some time before he found the answers he needed, or to gather the items he wished to gather.
With the help of the Dark Guild, including Harvey and Kelly, he had been able to proceed and get things over within an entire day. As his body was at the peak of the middle stage, there was no need for him to sleep to regain his energy.
On a lower level than Safa, Raze was even able to constantly meditate so that he was using cultivation techniques even when he was doing other things, regaining his energy, so as long as he didn't fight or use his powers, there was no need for him to sleep.