Fascinating book that explores the psychology behind our need for sleep. Thoroughly explores different threats to sleep, such as shift work and daylight savings time, as well as the resulting permutations of the effects of sleep deprivation upon our society.

Not hard to read at all. Palatable yet scientific, contains the results of studies as well as plenty of interesting anecdotes and ties to well-known historical events. The best $1 book I ever purchased.

Helped me try to figure out my own relationship to sleep by giving me a better understanding of the cues my body uses to set its own clock, and finally left me with the understanding that it’s OK if I naturally gravitate towards sleeping 9-10 hours per night.