When one reaches the magus level, sleep becomes an optional activity. However, for thousands of years, apothecaries have struggled to find medicines that can heal mental exhaustion as effectively as good quality sleep. There were a few high-grade pills or divine ingredients that could instantly heal such conditions, but none could match the rejuvenation of sleep, an activity that comes at no cost.
After the exhausting soul battle, Emery felt he could sleep for two days straight to fully recover. However, knowing he still had immediate matters to address, he allowed himself only eight hours of sleep—just enough to alleviate the pain from the battle. Once he felt somewhat refreshed, he swiftly returned to his Magus Domain.