A tumblr comment may be the source. I don’t see it anywhere else. So allow me to add a quote from 29-days-of-fog that summed up why I lay down and look up for a couple hours on dark trips, why I look up when I walk outside at night

you’ve heard of existential dread and existential horror, now get ready for existential peace, which is that feeling when you stare up at the nightsky and think, “huh. i exist. that’s pretty neat.”