Just to add a bit; I don’t know anything about brain chemistry, but if I cast the subjective experience into these terms I would imagine that this filtering occurs at higher levels of abstraction than the mentioned sensory input. Meaning that you have conscious awareness of ideas that your usual habits of thought would filter out before they reached conscious awareness. The vast majority of those ideas are just fun, creative, silly bullshit that can easily take on a quality of profundity that it is tempting to take far too seriously, but sometimes they can inspire more long-term creative paths, or even just let you appreciate your sober experience of the world in new and interesting ways.

This is useful for many of us who spend the vast majority of our thinking time in very utilitarian goal-oriented patterns. These habits of thought, while useful for earning a living working in a kitchen or whatever, for example, can hamper our ability to experience other sorts of creative, playful, and novel patterns of thought that make life fun. Breaking out of those habits can help bring new, vibrant perspectives on our living experience.