[Relys]

Yes, that theory is actually talked about in the book "Why We Sleep" which is mentioned in the comment you are responding too.

"Why We Sleep" and "The Body Keeps the Score" are two of the most helpful books I've ever read (and both found by reading HN book suggestions).

[Anthony-G]

It was Why We Sleep, alright. I had started the book last year but only read the first couple of chapters. I must return to it and finish it. Thanks for the other suggestion.

[mr_woozy]

seconded "The Body Keeps the Score"