Thank you! I was turned off even earlier by the glaring 'post hoc ergo propter hoc' logic error on the very first page of the text.

Quoting from the second paragraph, following a load of claims of the maladies that come from lack of sleep:

"Fitting Charlotte Bronte's prophetic wisdom that a 'ruffled mind makes a restless pillow', sleep disruption further contributes to all major psychiatric conditions..."

It is plain that Charlotte Bronte was inferring psychiatric conditions lead to sleep disruption, not the other way around.