Yesterday, Emperor Gaozu Liu Bang beheaded the white snake uprising, so it was an emperor's luck to dream of beheading the snake, haha.
As the saying goes: see things every day, dream every day. Dreams are often related to what you have seen and heard recently. Think about whether you have seen any movies or shots about snakes recently, such as Python and Snake Man.
In my opinion, your dream is influenced by movies. I used to see a saint before going to bed, but I dreamed of becoming a saint. It's normal for children to dream of becoming Altman or something.
So, don't worry at all. If you like, write down your dream and publish a book like Strange Tales from a Lonely Studio in the future.
In addition, it's best to watch something nice before going to bed, such as a beautiful and refined beauty, or a handsome guy with a well-proportioned figure, or a relaxed cartoon.