There must be regression. Though it flows so slowly and gradually you hardly notice it, like the sun falling across the sky, until dark falls and more shadows crawl.
It might be aging, or rather, time taking its toil on this aged mind filled with tiresome sights. It might be lamentation for things lost - a lot of things, personally and otherwise. My guess is it has a lot to do with how one views this world. And in how it is tilting, as if you are on a careening ship. Or from another perspective, the regression flows from within oneself, affecting how one sees the world. After all, the world is only as you see it, and a reflection of your thoughts. And of course, like everyone else, I am only and also one small drop of the big mystic river called life, which has never been more obscure. Then again, its obscurity only becomes clearer with more knowledge, though I doubt this helps.
On a positive note, the careening ship might just be changing course in rough water.