Maybe you need to knock an important errand off your list so you quit fretting about it.
Maybe you need to catch up on sleep.
Maybe there's a movie you really really really want to see in the theater.
Maybe you need some time alone to just take care of yourself & relax.
Maybe you want nothing more than to go out to play with your friends.
Whatever it is, give it to yourself. Make your well-being a priority today.