I'm not sure if this is relevant. The point about Brewer's yeast is literally in the last appendix, here: https://guzey.com/books/why-we-sleep/#appendix https:/

I'm not sure if this is relevant. The point about Brewer's yeast is literally in the last appendix, here: https://guzey.com/books/why-we-sleep/#appendix https://guzey.com/books/why-we-sleep/#appendix I do agree that this is a minor point and included this mostly out of curiosity.