Oliver Sacks is always entertaining. Give him a topic like hallucinations and he’s guaranteed to keep your attention. The appeal of much of his work is the plethora of patient & personal anecdotes that he peppers his books with. And the breadth of his coverage here is impressive: hallucinations derived from physical & emotional trauma, the blind missing their eyesight, epilepsy, drug use, sleep issues, eye disease, migraines, delirium etc. Within these strengths though is a modest weakness. So much is covered with so many rich anecdotes that I wanted time to breath. There were areas I would like to have been expanded upon. What was involved in the study of these various issues. Where are these studies going. What of the myriad repercussions teased—why don’t blind people realize that their hallucinations aren’t real simply because they know they can’t see—if 19th century literature was influenced by authors either having or being aware of the euphoria before epileptic seizures, then how far does that influence go—if the fortification illusion universally caused by migraines shows up in art patterns around the world, then what else shows up around the world in this way and what does it say about migraines. No book can cover everything and it is definitely a plus that Sacks brought up so many thoughts that tantalize, but some expansion somewhere would have been welcome. It’s all interesting, the chapter on drugs less so because our culture manages to talk about drugs a lot already, but most interesting to me were the chapters on migraines and sleep deprivation because they have a more personal relevance. This is the third Oliver Sacks book I’ve read and you can pretty much apply my overall response to this book to all three. All have been worth the time.