I have a lot of the same questions you do, and no answers. I intend to write to TS Wiley and ask her much of what you asked. BTW, regarding the authors, my suspicion is that Wiley is that actual author and champion of these ideas and that Bent Formby is a PhD who, no doubt, regards her information to be correct, but serves more as the official scientific figurehead to provide a stamp of legitimacy, if you know what I mean.
Now as to some of what you related:
When I started going to bed at 9 pm, a lot of times I would just lie there, wide awake. Somehow, the act of going to bed and turning off the lights caused my brain to wake up. I would eventually fall asleep though, and before the previously usual time. (previously usual?)
I also had difficulty going to bed this early. I would read in bed and end up turning out the light at 10. Even then I would often lay awake. But, I was still able to get up earlier and felt more refreshed.
A sort of corollary idea to Lights Out is that we also need lots of natural sunlight, and for those of us visually impaired to take off our glasses/contacts for at least a few minutes so we get the light in our eyes without lenses. Maybe spending more time outdoors is needed for us to really sleep well.
Agree with you 100% on this and I find that when I've spent time outdoors I sleep better at night. I, too, tend to spend too much time indoors. Like now.
As to how my family has adjusted, we really have it easy. It's just my wife and me and cat, and my wife gets up so early that she has to go to sleep at 9 or 9:30. We put up dark curtains and I made a little flip up/down cardboard flap that covers the digital clocks. I imagine it's hard with a family. [BTW I am a supporter of homeschooling].
There are some inconsistencies in the book, some things I don't agree with entirely, but her basic premise about the role light plays in health I believe is correct. Also her discussions about cortisol and exercise are fascinating.