I read that daydreaming is good for your health. Employing your visual imagination is a great way to activate relaxation triggers in your brain. I suppose that's assuming you're daydreaming about hanging out somewhere peaceful as opposed to storming a castle full of ninjas and slaughtering them. The article recommended that you think of something that made you feel happy and peaceful, and then you imagine yourself there as clearly as you can. Not only will you relax, but it's very cost effective. I remember my 7th grade health teaching going over poor mental health habits in class, and among the list was daydreaming, which I considered unduly harsh. I mean, what else were you supposed to do in high school.