From the beginning of time, people have struggled with sleep. As a result, we’ve accumulated a staggering body of wisdom about it — techniques and tips passed down from generation to generation. And we could fill a decent-size library (or a really spacious thumb drive) with all the sleep advice that’s been amassed in just the last decade in the wake of all the new scientific research.

There is no silver sleeping bullet that’s going to do the trick for everybody. People’s reasons for not getting enough sleep are deeply personal, specific to their lives and circumstances. And those reasons shift over time. Still, for those looking to improve their sleep life, it makes sense to begin with some of the scientifically proven general principles for good sleep habits.

Let There Be (Less) Light!

Light suppresses the production of melatonin, which signals us to sleep. So we should take steps — even before we climb into bed — to turn down the lights and make our bedroom the kind of calming, quiet, dark space that will coax us toward sleep. The National Sleep Foundation advises using low-wattage incandescent bulbs in your bedroom. Dr. Mathias Basner of the University of Pennsylvania echoed this advice. “Turn off the lights in the bathroom and instead use the light from the hallway while grooming before bed,” he told me. “Bathroom mirror lights can be excessively bright and thus suppress melatonin excretion. Also, turn the lights down during the late evening, and try not to expose yourself to bright light from the TV, e-readers, etc., late at night.”

The Blue Light That Is Killing Your Sleep

We also know that blue light, the sort given off by our ubiquitous electronic devices, is especially good at suppressing melatonin — which makes it especially bad for our sleep. Staring at a blue-light-radiating device before you go to bed can serve as “an alert stimulus that will frustrate your body’s ability to go to sleep later,” said George Brainard, a circadian-rhythm researcher and neurologist at Thomas Jefferson University in Philadelphia. “When you turn it off, it doesn’t mean that instantly the alerting effects go away. There’s an underlying biology that’s stimulated.”

When we ignore this fact, says Dr. Dan Siegel, a clinical professor of psychiatry at UCLA, the result can be a vicious cycle: “People are exposing their eyes to this stream of photons from these objects that basically tell your brain, ‘Stay awake. It’s not time to go to sleep yet.’ So it’s 10 p.m., it’s 11 p.m., it’s midnight — you’re checking for emails, you’re looking for texts — those light beams tell your brain, ‘Don’t secrete melatonin, it’s not time to sleep.’ And you’re up at 12:30, 1, you’re checking some more because you’re up, so why shouldn’t you check? Now, you go to bed at 1, you wake up at 6 because it’s time to go to work, that’s five hours of sleep.” Sound familiar?

The problem is that our relationship with our devices is still in that honeymoon phase where we just can’t get enough of each other — we’re not yet at the stage where we’re comfortable being apart for a few hours or taking separate vacations. In fact, a 2015 survey showed that 71 percent of Americans sleep with or next to their smartphones. We should think of light, especially blue light, as an antisleeping drug or a stimulant — something few of us would willingly give ourselves each night before bed, especially when so many of us are using sleeping pills or other sleeping aids in a desperate effort to get some sleep. There are some new technologies, such as f.lux software, that help mitigate blue-light exposure. But gently escorting our smartphones out of our bedrooms at least thirty minutes before we fall asleep is still the best option.

It’s Getting Hot in Here

Then there’s the matter of temperature. According to a study by researchers from the Clinique du Sommeil in Lille, France, the ideal sleeping temperature is 60 to 66 degrees Fahrenheit. The National Sleep Foundation recommends 65 degrees and says that sleep is actually disrupted when the temperature rises above 75 degrees or falls below 54 degrees.

As Natalie Dautovich, an environmental scholar at the National Sleep Foundation, said, a small drop in body temperature can prompt sleep signals to our brains: “We know that a cool bedroom environment is key to getting a good night’s sleep. We also know there are a lot of positive associations between fresh air and relaxation, and when we feel relaxed and comfortable in our environment, we’re more likely to feel sleepy.”

Let’s Get Physical: Exercise and Sleep

We also sleep better when we make time for regular physical activity in our lives. A study from Bellarmine University and Oregon State University found that “regular physical activity may serve as a non-pharmaceutical alternative to improve sleep,” at least for those who meet the basic recommended guidelines of 150 minutes per week of moderate exercise. And researchers at the University of Pennsylvania showed that those who walked for exercise got better sleep and that, as lead author Michael Grandner put it, “these effects are even stronger for more purposeful activities, such as running and yoga, and even gardening and golf.” In other words, move your body!

Eat Right, Sleep Tight (Eat Wrong, Up All Night Long)

With food and drink, it’s more a matter of what to avoid than what to take in. The obvious and all-too-common obstacle to a healthy sleep diet is going between caffeine and sugar all day so we end up tired but wired at night.

Most people know not to have coffee after dinner, but in fact caffeine’s power has a longer effect on our bodies than we think. A 2013 study from Wayne State University and Henry Ford Hospital in Detroit, Michigan, concluded that when taken even six hours before bed, caffeine can decrease sleep by as much as one hour. “The risks of caffeine use in terms of sleep disturbance are underestimated by both the general population and physicians,” the researchers concluded. In other words, our caffeine cutoff time should begin well before evening.

Would You Like to Come Up for a Nightcap?

The next stop on our tour of sleep-related misconceptions is the nightcap. Many people believe that a quick drink before bed helps them get to sleep — and the ritual has been endorsed by authorities from Winston Churchill to James Bond. What they don’t realize is what happens in their body afterward. According to a 2015 study from the University of Melbourne, alcohol does indeed initially act as a sedative. But later in the night, it changes allegiances and acts as a sleep disrupter. “The take-home message here is that alcohol is not actually a particularly good sleep aid, even though it may seem like it helps you get to sleep quicker,” said study author Christian Nicholas. “In fact, the quality of the sleep you get is significantly altered and disrupted.” A study from the London Sleep Centre confirmed this, finding that “at all dosages, alcohol causes a more consolidated first half sleep and an increase in sleep disruption in the second half of sleep.”

Adapted from The Sleep Revolution by Arianna Huffington. Copyright © 2016 by Christabella, LLC. Published by Harmony Books, an imprint of Penguin Random House LLC.

Originally published at


  • Arianna Huffington

    Founder & CEO of Thrive Global

    Arianna Huffington is the founder and CEO of Thrive Global, the founder of The Huffington Post, and the author of 15 books, including Thrive and The Sleep Revolution. In 2016, she launched Thrive Global, a leading behavior change tech company with the mission of changing the way we work and live by ending the collective delusion that burnout is the price we must pay for success.

    She has been named to Time Magazine's list of the world’s 100 most influential people and the Forbes Most Powerful Women list. Originally from Greece, she moved to England when she was 16 and graduated from Cambridge University with an M.A. in economics. At 21, she became president of the famed debating society, the Cambridge Union.

    She serves on numerous boards, including Onex, The B Team, JUST Capital, and Gloat.

    Her last two books, Thrive: The Third Metric to Redefining Success and Creating a Life of Well-Being, Wisdom, and Wonder and The Sleep Revolution: Transforming Your Life, One Night At A Time, both became instant international bestsellers. Most recently, she wrote the foreword to Thrive Global's first book Your Time to Thrive: End Burnout, Increase Well-being, and Unlock Your Full Potential with the New Science of Microsteps.