According to reports, a Labrador Retriever named "Wangcai" was able to open the door on its own late at night, sneak into its owner's room, and then return to its own bed to continue sleeping. The owner said that every time they wake up in the morning, they find that Wangcai's sleeping posture and position are different, as if he has experienced a wonderful night adventure. Experts speculate that Wang Cai's "sleepwalking" behavior may be related to changes in his brain waves during the deep sleep stage.