Agreed, that was my feeling as well. (BTW I believe at least one of the authors is a 'she' - not that it matters for your point, but...)

I have been trying to get more sleep since reading the book, and it may have helped some. However, I tend to do it more by napping rather than going to bed earlier, and I probably don't get as much sleep on average as reccomended by the book. Also while I have gotten the room darker, it isn't blackout conditions by any stretch.

Gooserider