Just a sleepless thought as I'm tossing and turning my pillow. At what time did someone think "Hey. This is actually something we could use in society."
Here is an older post of AskHistorians that answers this question:
https://www.reddit.com/r/AskHistorians/comments/1eyqcn/does_anybody_know_much_about_the_origins_of/
There are also a few more like it, if you search for "pillows" within the sub.