Sleep—it was a rare phenomenon for cultivators at higher levels. As their cultivation rose, so did their mental and physical energy reserves. While they may rest, this would typically be in the form of quiet meditation while absorbing ambient energies and essence to recuperate. To sleep, to truly and undoubtedly sleep, a cultivator had to exhaust their physical and mental energies to their limits, needing their body to rely on a primal state of slumber to initiate a process of rapid recovery.
Wei Wuyin often slept; the concept and importance of true sleep had never lost itself on his soul, and he enjoyed the sensation of dreaming, be it cold sweat-inducing nightmares or blissful dreams; it was the only way for him to meet those who've long since passed in his life. It was a type of joy for him.