This is the most basic induction of the Filter Editing series. It is a very basic approach to hypnotic trance which works along the same lines as Brain Drain, Automatically, Puppet Bot, and other drone or 'brain as computer' files I've made.
Your operating system filters things at different levels. Some commands, requests, or requirements are so basic that your brain submits them without your conscious review and you would have to exercise restraint to stop them. Breathing regularly, eating and drinking when you need to, falling asleep when tired, following a familiar route unthinkingly, climaxing when you're a bit too close to release.
Your body is a system and it is subject to permissions editing. Then there are things you get to review, decision-level filters. Then there are things you know you don't like, so you reject them unthinkingly without needing to do anything about it.