--- title: ▍Sleep Is Your Superpower created: 2026-05-26 modified: 2026-06-10 authors: Matt Walker category: TED Talk tags: [] --- > I could tell you about sleep loss and your cardiovascular system, and that all it takes is one hour. Because there is a global experiment performed on 1.6 billion people across 70 countries twice a year, and it’s called daylight saving time. [^1] Now, in the spring, when we lose one hour of sleep, we see a subsequent 24-percent increase in heart attacks that following day. In the autumn, when we gain an hour of sleep, we see a 21-percent reduction in heart attacks. Isn’t that incredible? And you see exactly the same profile for car crashes, road traffic accidents, even suicide rates. > The first is regularity. Go to bed at the same time, wake up at the same time, no matter whether it’s the weekday or the weekend. Regularity is king, and it will anchor your sleep and improve the quantity and the quality of that sleep. The second is keep it cool. Your body needs to drop its core temperature by about two to three degrees Fahrenheit to initiate sleep and then to stay asleep, and it’s the reason you will always find it easier to fall asleep in a room that’s too cold than too hot. So aim for a bedroom temperature of around 65 degrees, or about 18 degrees Celsius. That’s going to be optimal for the sleep of most people. And then finally, in taking a step back, then, what is the mission-critical statement here? Well, I think it may be this: sleep, unfortunately, is not an optional lifestyle luxury. Sleep is a nonnegotiable biological necessity. It is your life-support system, and it is Mother Nature’s best effort yet at immortality. And the decimation of sleep throughout industrialized nations is having a catastrophic impact on our health, our wellness, even the safety and the education of our children. It’s a silent sleep loss epidemic, and it’s fast becoming one of the greatest public health challenges that we face in the 21st century. > So if you are staying in bed awake for too long, you should get out of bed and go to a different room and do something different. The reason is because your brain will very quickly associate your bedroom with the place of wakefulness, and you need to break that association. So only return to bed when you are sleepy, and that way you will relearn the association that you once had, which is your bed is the place of sleep. So the analogy would be, you’d never sit at the dinner table, waiting to get hungry, so why would you lie in bed, waiting to get sleepy? [^1]: **Daylight Saving Time = DST (日光節約時間)** or **Summer Time (夏令時間)** is the practice of setting the clock forward by one hour during the warmer months in order to extend evening daylight. Typically, clocks are set forward in the spring and set back in the fall. This practice aims to make better use of daylight during the longer days of summer, potentially saving energy and encouraging outdoor leisure activities in the evening.