8 Simple Ways You Can Get Smarter While You Sleep
What you do before going to bed (or tucking in for a nap!) can make all the difference in your brain power. These are the simple tweaks that can sharpen your mind.
Sleep is sound
Simply getting enough sleep will grant you better focus the next day, reports the National Institute of Neurological Disorders and Stroke: Slumber helps the brain form new neural connections and consolidate memories. But you can enhance your sleep the same way you enhance your meals with greens and healthy spices: By following these tips tonight, you can ensure you'll be at your sharpest tomorrow.
Pump up the pink noise
You've heard that white noise (like the light sound of a ceiling fan) is one small change you can make to catch more Zzzs. But pink noise, in which lower frequency sounds are more powerful—like the rush of a waterfall or pounding rain—may boost your brain, according to a study published in 2017 in Frontiers in Human Neuroscience. The researchers found that when older adults listened to pink noise, their deep, slow-wave sleep improved, and then they scored three times higher on a memory test the next day compared to how they performed after receiving false treatment.
"Most people won't notice much difference between white noise, pink noise, and brown noise except that pink noise has more of a 'hiss' sound and brown noise has more of a 'shush' sound, with white noise in the middle," says Michael Grandner, PhD, director of the Sleep and Health Research Program at the University of Arizona in Tucson. "All of these work well at absorbing environmental sounds, but pink noise may have the ability to specifically induce brain wave patterns that enhance sleep, even though it is usually less able to filter out lower-frequency sounds and most patients report that it is less pleasant to fall asleep to." Want to try it for yourself? Download a pink noise app and hit the sheets.
Take a whiff
You already know that the smell of an apple pie coming out of the oven can send you straight back to mom's kitchen, but it can also strengthen your brainpower at night. In a study published in Science, participants played a memory game while a rose scent was in the room. After going to sleep, the researchers sent the rose aroma back into the room for one group. Those who were exposed to this scent during the night, during slow-wave sleep, had a better recall of the day's task compared to other groups. The researchers say that the olfactory system activates prior memories in the hippocampus, making it easier to store new info. Not everyone is convinced, however. "I don't think there's a chemical in scents that will help people sleep faster or deeper," says Nitun Verma, MD, spokesperson for the American Academy of Sleep Medicine. "But creating a calm environment that helps you relax and unwind from the day is great! If a happy scent helps you relax, go for it." All you need is a diffuser and your favorite scent and you're ready to make memories. (Try these 5 brain-boosting foods that will make you smarter.)
Have a glass of wine
If you like to indulge in a glass of wine daily, there are certain benefits to your health—including your brain. For a study published in 2017 in Scientific Reports, participants took part in a word-learning activity, then drank alcohol or abstained. The next morning when they repeated the cognitive task, those who were in the drinking group performed better than the teetotalers. (In fact, the more they drank, the better their memory. It's still recommended that women consume one drink per day, and men two drinks per day at most.) Alcohol may put brain cells into a state that allows them to consolidate memories, and sleep may enhance that effect. This is what happens when you drink a glass of wine.
Avoid late-night noshing
If you find yourself performing midnight raids on the fridge, you may want to rethink your snack times. An animal study published in 2015 in Neuroscience suggests that eating at "off" hours (when you should be snoozing) can cause a hiccup in the activity of a protein that affects both the circadian clock and the hippocampus, the area of the brain responsible for memory.
"The best snack is no snack since most people's metabolism is least efficient at burning energy you consume at night," says Dr. Grandner. "This means that not only will calories consumed at night be more likely to result in weight gain and other disruptions to metabolism, but if you are hungry for a late-night snack, it might actually mean that you should have gone to bed already." Satisfy the munchies earlier and save your smarts. When it is time to snack, don't miss these 23 foods that will boost your brain.
Study before snoozing
Want to make sure you remember what you've just learned? Study before bedtime so you can sleep on it. A study published in 2019 in Current Biology found that the sleeping brain can encode new information and store it for the long-term. But it's important to "get plenty of sleep after studying in order to maximize your learning," says Dr. Grandner. "The sleep doesn't need to occur immediately after studying, but it should happen before the next day." (Need help getting rest? Check out the best mattress for every kind of sleeper.)
Dream about it
If a work task or presentation pops up in your dreams, be happy it did because you may be able to remember more later. No matter what it was about, your dreams reveal a lot more about you than you think. Learning is encoded into your hippocampus during the non-rapid eye movement sleep stage (NREM). Dreaming about something you learned earlier that day during NREM sleep can help improve your memory, according to a study published in 2010 in the journal Current Biology. In the study, people were trained to learn about the layout of a complex maze and then tested five hours later after an afternoon nap. Those who had dreams related to the task performed better compared to those who didn't have these reveries or who stayed awake and simply thought about the task. (Find out the 12 quirky habits that prove you're smarter than most.)
Take a nap
Here's another reason to "sleep on it." A study of adults 65 and over, published in 2016 in the Journal of the American Geriatrics Society, suggests that post-lunch napping can help improve cognition. The nap-skippers in the study had significantly poorer cognition than short nappers. Here's why napping is good for your brain.
Wake up on time
You'd think the more sleep you get the better, but that's not the case. "People who get nine to 10 hours of sleep or more on average tend to be in worse health," says Dr. Grandner. He echoes the results of a study published in 2014 in Journal of the American Geriatrics Society which found that older women who slept more than nine hours a night or fewer than five fared worse on cognitive tests compared to those who logged seven hours of shut-eye. In fact, sleeping too much or too little was equivalent to having a brain that was two years older. The amount of sleep (more than nine hours or less than five) may be an indication that you're having less quality, more fragmented sleep, which can take a toll on your brain health. Next, find out the secrets sleep doctors want you to know.
- National Institute of Neurological Disorders and Stroke: Brain Basics: Understanding Sleep
- Frontiers in Human Neuroscience: "Acoustic Enhancement of Sleep Slow Oscillations and Concomitant Memory Improvement in Older Adults"
- Michael Grandner, PhD, director of the Sleep and Health Research Program at the University of Arizona in Tucson
- Science: "Odor Cues During Slow-Wave Sleep Prompt Declarative Memory Consolidation"
- Nitun Verma MD, spokesperson for the American Academy of Sleep Medicine
- Scientific Reports: "Improved memory for information learnt before alcohol use in social drinkers tested in a naturalistic setting"
- Neuroscience: "Misaligned feeding impairs memories"
- Current Biology: "Implicit Vocabulary Learning during Sleep Is Bound to Slow-Wave Peaks"
- Current Biology: "Dreaming of a Learning Task Is Associated with Enhanced Sleep-Dependent Memory Consolidation"
- Journal of the American Geriatrics Society: "Afternoon Napping and Cognition in Chinese Older Adults: Findings from the China Health and Retirement Longitudinal Study Baseline Assessment"
- Journal of the American Geriatrics Society: "Sleep Duration In Midlife And Later Life In Relation To Cognition"