That is an excellent book. However, it doesn't contain a lot of practical advice (other than the 12 points at the end of the book, which were released already by National Sleep Association)
Somewhat tangetial, check out "The Circadian Code" as well - a lot of more practical advice in this one. They actually disagree on couple of delicate points, so not sure how can one make up one's mind as to which one's correct (e.g. one thinks there are night owls , one thinks it's a myth; one thinks we need 7 hours of sleep, one thinks that less than 8+ hours of sleep is devastating).
But in general, the message is the same - sleep well, try to fit into your circadian rhythm because all organs have internal clocks and being in rhythm benefits them all; some of them are interconnected, some are dependent on SCN, etc
In particular, the clinical trials with TRE (Time-Restricted eating, as in putting all calories in 8-12 hour intervals daily) seem amazing. Not a single side-effect, and all health markers seem to be improving under it.
One important study on mice concluded that mice that ate their high-fat, high-sugar food in 8 hour intervals (lets say, 8AM -> 4PM) compared to the control group of regular mice that had high-fat, high-sugar food all the time, ate more or less the same amount of calories daily, but the TRE-group had no increase of blood sugar or body fat.
Seems too good to be true, but apparently the study has been replicated..