Why We Sleep

An accessible tour of sleep science, its functions, and the everyday conditions that support better rest.

The research provided supports behavioral sleep interventions for insomnia: nurse-led brief behavioral treatment and simplified sleep restriction improved insomnia severity and some sleep outcomes in selected adults compared with sleep hygiene. These trials do not establish that reading this book produces those outcomes, nor do they substantiate the book’s broader causal claims about cancer, Alzheimer’s disease, longevity, or other diseases.