The 200-year-old Welsh idea that made us believe in 8 hours of sleep

There is no clear evidence that Robert Owen literally stated that people should sleep 8 hours. That seems more like a modern interpretation of his general advocacy for sufficient rest

If you close your eyes in the evening and think, "I must sleep eight hours to function somewhat normally tomorrow," the first thing that probably comes to mind isn’t the name of a textile manufacturer from Wales. But maybe it should be. Especially if you only get six or seven hours that night, or lie awake for an hour and a half halfway through.

The idea that we need eight hours of sleep comes from Robert Owen. In 1817, he launched a revolutionary phrase: "8 hours work, 8 hours recreation, 8 hours rest." In Owen’s time, that division was downright radical. During the early Industrial Revolution, workers — including children — worked up to 16 hours a day. The few hours left were for eating and sleeping. Rest was necessary for survival.

Owen didn’t see his workers as machines. He believed that people needed rest to live and function well. Sleep was, to him, a human right.

It’s quite remarkable that his idea was embraced so widely. It came at the right moment. Working conditions were inhumane, and discontent was growing. Owen’s formula was adopted by labor unions and workers’ movements in Europe and North America. "8-8-8" became a rallying cry during strikes and protests.

Sleep is not a pause from life, it is life

In the 20th century, science began to confirm what Owen intuitively understood: sleep is not a pause from life, it is life. During sleep, you recover, process emotions, build memories, and give your brain a chance to recharge. More and more doctors and researchers began to promote the idea of 8 hours of sleep as a guideline. Owen’s division gained not only social but also medical authority.

To this day, the idea lives on. Worldwide, health recommendations advise sleeping 8 hours per night. It feels almost like an ironclad law. But it’s not.

A scientific consensus study by the National Sleep Foundation from 2015, based on over 300 previous studies, concluded that there is no optimal number of sleep hours. Age, genetics, health, lifestyle, and many other factors together determine how much sleep you need.

What’s more important than the number of hours is how you feel during the day. Can you concentrate? Do you feel emotionally balanced? Do you usually wake up without an alarm clock and manage your day without liters of energy drinks or coffee? Then you’re probably doing fine, whether you sleep 6.5 or 9 hours.