Go to bed! Brain researchers warn that lack of sleep is a public health crisis.
In the screen-lit bustle of modern life, sleep is expendable. There are television shows to binge-watch, work emails to answer, homework to finish, social media posts to scroll through. We’ll catch up on shut-eye later, so the thinking goes — right after we click down one last digital rabbit hole. Brain research, which has pushed back hard against this nonchalant attitude, is now expanding rapidly, reaching beyond the laboratory and delving into exactly how sleep works in disease and in...