The Family that Couldn’t Sleep is a bit of a misnomer. Although the underlying thread revolves around a mysterious and terrifying disease called fatal insomnia, multiple chapters are devoted to other diseases, including bovine spongiform encephalopathy (better known as mad cow disease) and kuru (a fatal neurodegenerative disorder thought to be caused by cannibalism). All of these conditions are caused by mutations in prions, which are proteins of the central nervous system.
Most of the information on these diseases is fascinating, though some of the more technical information might require several re-reads if you’re a non-specialist (like me). Also, if you picked up this book wanting to learn exclusively about fatal insomnia, you might find yourself wanting to skip some of the other chapters.
Even so, this book provides a fascinating look at the tragic nature of fatal insomnia, especially the Italian family genetically predisposed to it. You’ll find yourself both sympathizing with them and horrified by the unrelenting nature of the disease.
I would recommend The Family that Couldn’t Sleep to anyone who is interested in prion diseases or epidemiology in general.