I'm thinking of standing up and peeing on my bed on purpose
That is gross. What would you gain from peeing on your bed?
I was planning to return to my bed for sleeping after.
Peeing in your bed purposefully when you are going to sleep there is bad and unhealthy for you. Get up and go to the bathroom when you have to pee.
It's not like anyone cares, who would know except me?
It's not about who knows. It's about being unhygienic. It is unclean to sleep in your own urine plus people in your house will smell it on you anyway.