THE RICH world has a sleep deficit. The average American adult snoozes almost two hours less than their great grandparents did. More than a third of Americans get less than seven hours of kip a night. The resulting fatigue has been linked to Alzheimer's disease, hypertension and other ailments. It may cost America's economy as much as $400bn a year, according to one study. Other wealthy countries are similarly sleepless. Consumption of alcohol and caffeine are partly to blame, as is exposure to phone and computer screens.

https://www.economist.com/business/2022/02/12/the-sleep-tech-industry-is-waking-up

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