You can take this idea one step further and not only avoid external stimuli but also internal ones. This is effectively mindfulness meditation. You try to not "

You can take this idea one step further and not only avoid external stimuli but also internal ones. This is effectively mindfulness meditation. You try to not "react" to stimuli (both external and internal) and just observe. Is feels very unusual in the beginning but can have a huge benefit on your life. FWIW I use the app "Waking Up" from Sam Harris.