Sayu is a playable character in the video game Genshin Impact. Sayu is known for her love of sleep, and she can often be found napping in the most inconvenient places. Sayu's sleeping ability is actually a secret technique that she learned from her master. The technique allows her to enter a state of suspended animation, which allows her to recover her energy quickly. Sayu uses this technique to stay hidden from enemies and to sneak around undetected. A fanart Genshin Impact progress bar for YouTube with Sayu Sleeping.