Left alone in the office, Lucius used this rare moment of peace to rest his mind.
The continuous bouts of high-intensity battles and the need to maintain a high tension state had resulted in a fair bit of fatigue building up within his mind and body.
Due to the environment and circumstances in which he had lived in his previous life, Lucius was required to always remain in a 'battle ready' state. He did not have the luxury of sleeping and was constantly embroiled in high-intensity battles.
All living things require sleep at one point or another. It was nature's most effective way to restoring fatigue. However, due to Lucius' inability to do so, he had to get creative. The result of that creativity was using soul power to remove fatigue.
Soul Power by nature had the ability to restore and regenerate. With some clever application, the need for sleep could be completely removed.