I also find reading multiple books in parallel really helpful. In this way, you can read multiple kinds of books.
For example, I am currently reading a "mathematical book"- Jordan Ellenberg's 'How Not to Be Wrong', a big fat novel in my native language, and Rumi's poetry in English.
It get's tiring to read serious non-fiction for multiple hours but there is still appetite for reading left. You should switch to a fiction then. And read poetry and book like Meditations by Aurelias now and then, maybe not even linearly.
I have found this combination to work for me really well.
It's really helpful because, at least in my case, it actually gives you a "permission" to enjoy whatever the heck you feel like reading at the time, instead of being obligated to wait for being ready to read "that one" book.
So, currently, I actually think I'm reading one book about communication & negotiation, one about habits, one about investing (I'm complete dummy when it comes to it) and depending on the amount of stress at job, I'd re-read some of Seneca's writings.
For example, I am currently reading a "mathematical book"- Jordan Ellenberg's 'How Not to Be Wrong', a big fat novel in my native language, and Rumi's poetry in English.
It get's tiring to read serious non-fiction for multiple hours but there is still appetite for reading left. You should switch to a fiction then. And read poetry and book like Meditations by Aurelias now and then, maybe not even linearly.
I have found this combination to work for me really well.