Getting a full night's sleep

Do you have a problem sleeping? The US Centers for Disease Control and Prevention says insufficient sleep is a public health problem linked to chronic diseases such as type 2 diabetes, heart problems, obesity, and depression. The implications for human longevity are obvious. So what can be done to get a better night's sleep - even if you think you've tried everything? The Silicon Valley startup, Koko Labs, has developed Full Sleep, a six-week program guided by artificial intelligence (A...