To Sleep Better, Change What—and When—You Eat
The right foods and strategic scheduling can improve your shut-eye
4 min
Did your mum ever suggest a warm glass of milk to help you sleep?
Science says she may be right.
An emerging field of research called chrononutrition indicates that choosing the right foods and meal times may improve our sleep . Some key findings: Eat dinner early. Keep consistent schedules. And, yes, drink milk.
You already know that fruits, veggies and lean protein are good for your health. But they can boost your sleep, too. These foods are the basis for the Mediterranean diet, which research shows may improve sleep quality, reduce sleep disturbances and boost sleep efficiency—the amount of time you spend asleep when you are in bed.
Eating a Mediterranean or other similarly healthy diet is linked to a reduction in symptoms of insomnia , according to a just-published review of 37 studies with almost 600,000 participants. This same research also found that unhealthy diets—high in simple carbohydrates and processed foods —are associated with an increase in insomnia symptoms, says Frank Scheer, a professor at Harvard Medical School, who studies the internal body clock.
When we eat affects our internal body clock, or circadian system, which regulates our physiology and behaviour, including sleep. While our master clock resides in our brain, each of our organs has its own clock, too. We don’t want to wake up our stomach just when we’re trying to go to sleep.
“There’s a rhythm to our digestive system,” says Kelly Baron, director of the behavioural sleep medicine program at the University of Utah. “And eating at the wrong time can cause internal jet lag.”
Roughly a third of American adults don’t get the recommended seven to nine hours of sleep, according to the Centers for Disease Control and Prevention.
When Sarah Linderman, 46, started having sleep problems several years ago—tossing and turning for hours before drifting off, then popping awake for good at 3 am — a doctor suggested she focus on her diet.
The doctor recommended she consume more of her calories earlier in the day, load up on protein and veggies, cut back on cocktails at night and finish her last meal at least three hours before bedtime. Linderman soon found herself falling asleep more easily. She also began sleeping seven or eight hours uninterrupted and waking feeling refreshed in the morning.
“With the right nutrition, I took my sleep back,” says Linderman, who owns a marketing company in San Pedro, Calif.
What’s the best way to adjust your diet to improve your sleep? Here’s some advice, according to a growing body of research.
Follow a Mediterranean diet
A diet high in vegetables, fruits, whole grains, fish and unprocessed lean meat is good for nutrition and may promote sleep by reducing inflammation and providing nutrients that boost the neurotransmitter serotonin and the hormone melatonin. It also balances our gut microbiome , which may help regulate our circadian rhythm, says Uma Naidoo, a nutritional psychiatrist and director of nutritional, lifestyle and metabolic psychiatry at Boston’s Massachusetts General Hospital.
Some nutrients are particularly helpful.
Tryptophan is an amino acid necessary to produce melatonin. Our bodies can’t produce tryptophan, but foods that provide it include turkey, chickpeas, milk, grains, nuts and seeds.
Serotonin is also a precursor to melatonin. Fruits, vegetables and nuts can help boost serotonin.
Melatonin promotes sleep and influences the timing of the circadian system. Eggs, fatty fish such as salmon, mushrooms, bananas and tart cherries help promote it.
Naidoo’s perfect sleep-promoting dinner suggestion? A mushroom omelet with a side salad topped with flaxseed and walnuts.
Have an early dinner
People who eat close to bedtime have poorer sleep quality, studies show.
Researchers think this may have something to do, in part, with body temperature. Our body typically cools down before bed; this is an important part of our circadian rhythm. Digestion heats our body up, messing with this process.
“Your stomach is working up a sweat just as you’re trying to wind down,” says Marie-Pierre St-Onge, director of the Center of Excellence for Sleep and Circadian Research at Columbia University.
Eating before bed can also cause acid reflux, which often disrupts sleep.
A good rule of thumb, researchers say: Eat dinner at least two to three hours before bedtime to give yourself time to digest your meal.
Be consistent about meal times
Having a regular eating rhythm sends a strong signal to your brain about when it is time to be alert and when it is time to be drowsy, says the University of Utah’s Baron.
Try to eat your first meal and your last meal around the same time each day. “This bookends your day and helps differentiate between waking activities and nighttime,” Baron says.
Eat breakfast
When we don’t eat breakfast, we tend to get hungrier at night. And that sets us up for making poorer food choices closer to bedtime, says St-Onge.
Some studies have shown that people who skip breakfast have lower sleep quality. Researchers aren’t sure why, but they believe it’s because people who eat breakfast tend to practice other healthy habits, such as being more active.
Cut back on alcohol
Yes, alcohol may help you wind down at night and fall asleep faster. But it also messes with your sleep quality . (Do I really need to tell you this?) It suppresses REM sleep, causes sleep disturbances and shortens sleep duration, says Massachusetts General’s Naidoo.
A light evening snack is OK
Hunger is stimulating because the hormones that make you seek food are the same ones that arouse you from sleep, says Columbia’s St-Onge. It’s hard to fall asleep when you’re obsessing about the ice cream in your freezer.
If you eat a snack, make it light and have it at least an hour or so before bed. Pair protein and healthy carbohydrates—hummus and pita or fruit and yogurt—for the biggest sleep boost. Protein is satiating and carbohydrates promote sleepiness by helping the absorption of tryptophan.
And, yes, milk can help, too. A study of people recovering from a cardiovascular event showed that they slept better if they drank milk with honey before bed. And, in general, people who consume more milk throughout the day have better sleep, research shows. Milk is a good source of tryptophan, St-Onge says.
So go ahead and listen to your mum. Have that glass of milk.
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Randy Boyagoda’s new novel, “Lords of Serendipity,” delivers a biting satire of cheating, politics and dysfunction across modern universities.
5 min
Administrative cowardice. Rampant cheating. The soaking and scamming of undergrads and grad students. Performative wokeism. Intensifying competition for international tuition dollars from an expansive China.
These are either the latest dire headlines about American higher ed or the myriad subplots of “Lords of Serendipity,” an ambitious new novel by Randy Boyagoda. Unlike most campus fiction, its scope extends well beyond the cloister of the liberal arts classroom to whammy the entire university system, from its financial model to its function within a globalized economy. Along the way, it skewers its lightning-rod targets with a precision too sharp to be considered entirely fictional.
That its author is not only well-versed in satire, having written four other novels in the genre, but is also a professor of English at the University of Toronto and an experienced college administrator, further blurs the lines between comic fiction and brutal fact. It’s the kind of no-holds-barred book only a consummate insider would know to write—but only one who is also conveniently outside the American university system could get away with writing.
“This is someone who’s got the inside dope on what can go on at universities, especially with international students, and what kind of con games are going on,” said Margaret Atwood, a friend and fellow Torontonian.
The novel, like Boyagoda himself, is often very funny—even as the dilemmas its characters face read as tragedy. Its cast includes the bickering members of a Sri Lankan hotel cleaner’s family, insecure American freshmen, dead-end third-tier college professors and their highflying Ivy League counterparts and dispirited university functionaries. An old-fashioned Dickensian tale, it sweeps across continents and campuses, from a classic liberal-arts college to a stand-in for Harvard University to an urban technical school to the dilapidated buildings of a state-run university in Sri Lanka.
“I’m a joyful person,” Boyagoda said in an interview, though he prefers to see his outlook on academia as “hopeful” rather than optimistic. He smiles and laughs frequently. He bikes everywhere. He derives energy from his students and from his four daughters, ages 14 to 20. They help him and his American wife, Anna, also an educator, care for Boyagoda’s father, an immigrant from Sri Lanka who has dementia and lives with the family.
The germ of the novel came to Boyagoda during the pandemic, when he was serving as a vice-dean. An urban legend was circulating about a statistics grad student selling passing grades to international students. The cheating scheme itself may well have been apocryphal, but it felt tantalizingly plausible.
“As a novelist, it stayed with me,” Boyagoda said. “Who would sell grades for a stats course? Why would someone buy grades? What’s motivating them? Why wouldn’t the university be doing something about it?” What he didn’t want to do, he explained, was write “another novel about a creative writing professor and his drama with students.”
In addition to writing novels—the first of which was a finalist for Canada’s prestigious Giller Prize; he’s written eight books in total—Boyagoda teaches literature full-time. For his students next semester, kids raised in a purportedly “post-literature era,” he’s assigning three 700-page novels, he noted mischievously, books by George Eliot, Ralph Ellison and Kiran Desai.
On RateMyProfessors, students remark on Boyagoda’s heavy assignments, tough grading and distaste for cellphones, but also hail his “comedy.” When alerted to these reviews, Boyagoda laughed. “Guilty as charged,” he said.
“Randy’s one of those people in academia who is very well educated but doesn’t have an ounce of superiority about him,” said John Irving, who frequently guest lectures in Boyagoda’s classroom. “It’s amazing to see how willing students are to talk in his classrooms, how little afraid they feel of being mocked or put down—he gets complete candor out of them.”
Negotiating competing interests seems to come naturally to him. Like many college campuses, after the Oct. 7 Hamas attack on Israel, the University of Toronto was embroiled in protests, encampments and discord; part of the school’s response was to convene a working group on civil discourse. Boyagoda was put in charge, serving for two years. It’s the kind of thankless task many professors would flee from, but Boyagoda relished the prospect and thinks the group, which is ongoing, made progress.
He has since pivoted to another formidable academic concern: the waning prestige of the humanities. In July, Boyagoda became the director of the Jackman Humanities Institute and special advisor on the humanities to the dean of arts and science. This fall, he is starting a series of gatherings he calls the Dead Book Club. (Dead writers feature heavily among his favorites: St. Augustine, Dante, William Faulkner, Evelyn Waugh, Saul Bellow.)
“The goal is to encourage students to read for its own sake and have conversation for its own sake,” Boyagoda said. “The importance of the humanities will be revealed to those who participate.”
“Lords of Serendipity,” which publishes next week, reflects Boyagoda’s commitment to the pursuit of knowledge: “I’m supposed to say I learn more from my students than they do from me, but no,” Boyagoda said. “I enjoy sharing my excitement and joy about literature and ideas. There are these moments when you are teaching and you can see someone’s face change because they didn’t know something and then they did. That moment when you’re actually watch someone enlarge themselves is deeply satisfying.”
In literary circles, Boyagoda is often referred to as a Catholic novelist, a description he embraces. “A novelist willing to give shape and voice to contemporary religious experience is needed,” Boyagoda said. “I understand myself as a Catholic novelist, provided that I’m not only a Catholic novelist, I’m also a South Asian novelist and I’m a Canadian novelist. I don’t want to be captive to one label.”
His characters, he said, are subjected to what he calls “Graham Greene character situations.”
“They are trying to do good in a fallen world and realize the most they can do is less harm than someone else would do in that same role,” he explained. “They have to accept they are complicit in something that provides some good thing to others. It’s a very Graham Greene way of thinking about sacrifice.”
The campus green they inhabit is a febrile zone in which lofty ideals and cynicism regularly collide. It’s a place where a traditional holiday college celebration is now an occasion for political protest. Kids freely police one another inside and out of the classroom with social media their constant, ready weapon of choice. International students, knowing their family’s financial futures hinge on their degrees, operate in terror of failure and deportation.
Early readers of the book include Gary Shteyngart and Junot Diaz, both of whom have taught at universities and written comic novels. They each contacted Boyagoda midway through to say, in essence, “You nailed it.”
As biting as “Lords of Serendipity” can be, Boyagoda’s faith in higher education remains undaunted.
“It’s absurd that we live in societies that make the decision to take people between the ages of 18 and 22, when they are most physically capable of contributing to our nations and communities, and tell them, ‘Go away for four years, and read and learn and have conversations,’” he said. “I want students to be aware of what an incredible privilege that is.”
Corrections & Amplifications
Randy Boyagoda is a special advisor on the humanities to the dean of arts and science at the University of Toronto. An earlier version of this article incorrectly said he is a special adviser to the dean of humanities. (Corrected on Sept. 2)
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