Dr. Matthew Walker, a professor of neuroscience and psychology at UC Berkeley, argues that sleep is the single most effective thing we can do to reset our brain and body health each day. He posits that modern society is in the midst of a "silent sleep loss epidemic" that is damaging our health and life expectancy.

According to Walker, healthy sleep is defined by four specific "ingredients":

If you can't sleep after 20 minutes, get out of bed and do a relaxing activity until you feel sleepy. VI. Digital Copies

The book divides the benefits of sleep into two main categories:

If you are looking for the Spanish edition ( Por Qué Dormimos ) or the original English version in digital formats: