Though it’s a large field, every single one of New York‘s picks were recommended by at least two experts.

Four of our experts recommended Why We Sleep by Matthew Walker, the director of UC Berkeley’s Sleep and Neuroimaging Lab, making it the top suggestion on this list. The book answers important and often-asked questions about sleep (how do caffeine and alcohol affect how much we get? What happens during REM? How do common sleep aids affect us, and can they do long term damage?) with easy-to-read scientific evidence.

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