Quotes from Matthew Walker

The fact that we don't have that biologic pressure to have highly polyphasic sleep, I think, probably tells us something in terms of, truly, whether it's useful or not.

The time of night when you sleep makes a significant difference in terms of the structure and quality of your sleep.

I think the first general point to make from epidemiological studies across millions of people is the following - that short sleep predicts a shorter life. It predicts all cause mortality.

Your subjective sense of how well you're doing under conditions of sleep deprivation is a miserable predictor of, objectively, how you actually are doing.

We know that efficiency and effectiveness are increased when you're getting sufficient sleep, and it will take you longer to do the same thing on an underslept brain, which means you end up having to stay awake longer. So goes the vicious cycle.

No one wants to give up time with their family or entertainment, so they give up sleep instead.

I give myself a non-negotiable eight-hour sleep opportunity every night.