If it is a FT mouse, go for it. I know some people have very shy snakes that will eat the mouse over night. If the snake does not eat it over night, remove the dead mouse and try again in a week.
If it is live, you are asking for trouble. A live mouse unattended can possible cause some serious damage to your snake. If can chew and claw the flesh and meat off of your snake. It is better to supervise a live feeding, and if the snake refuses- pull the mouse out and try again in a week![]()