The paradox is, that even if you’re doing nothing, you’re doing something. You think, you feel, you wonder, you contemplate, and so forth. Doing nothing is therefore a purely mental deed, where your internal doings overcome external doings.
We are taught by socialization that we always have to do something that is external of us, besides resting and sleeping. This teaching is one of the elements of today’s financial materialism - that our self-worth has to be justified by occupying ourselves externally of us, while inner-indulging is taught to either be a waste of time, boring, or a purely egotistical thing, because when we do nothing we don’t promote society.
But there is no obligation to promote society all the time, and a little dose of egotism from time to time isn’t something horrible. By doing nothing, we can let ourselves completely venture within our minds, within the Internal World, a World we often ignore in this fast-paced, socially-stressed, obsessive modern world.
You can think of doing nothing as a metaphor to going to Silent Hill. In Silent Hill, the main character exists outside of the “real” world, the so-called “real” life. Their actual, physical body is almost always unknown in regards to its whereabouts, because their external body is irrelevant in a place which is a product of your subconscious.
Like when in the video game Silent Hill, when you’re doing nothing for extensive periods of time, you go into a inner journey in your Inner World, where you can confront thoughts and emotions you otherwise repress, because you focus on things externally of you, like day-to-day responsibilities.
The most common example of what I’m trying to convey is in Silent Hill 2, where the hero, James Sunderland, isn’t actually in a place within the world. Silent Hill is merely a product of his subconscious. The monsters he confronts throughout the game do not exist beyond his mind; rather, they are representations of his repressed thoughts and emotions, and his confrontations with them is a metaphor of him dealing with his various repressions and denials.
The same is possible when doing nothing - you get a chance to confront your automatic thoughts and emotions which shape your personality and your system of beliefs. Even when you don’t do anything externally of you, you can, by doing nothing, to inspect things about yourself you usually ignore and put them into view.
When put in that way, doing nothing can be seem to be like either an adventure or a psychological horror. Perhaps this is why there is this common fear to be alone - it is the fear of doing nothing. If there is this fear, then it must have some kind of reason to be fear, and that reason I believe is the fear of confrontation with the repressed, dark self.