How many books do you typically read at once, and how do you pair them together?

I typically read 2-3 books at a time, trying to separate them content-wise as much as possible to avoid any confusion. For example, I’m currently reading a thousand-page fantasy novel, collection of horror short stories, and a non-fiction memoir. I find that this gives me a bit of a sense of variety, as I tend to have trouble keeping concentration on one book for too long. Are you a single book at a time kind of person or constantly reading full stacks?