The Journal.
Every essay, review, field note, and interview we've published. New pieces arrive on Tuesdays; full issues close every three months.
Sleep Apnea Market Sizing Is Measuring the Wrong Population
Alternative sleep apnea therapies are not taking share from CPAP. They are being sold, for the most part, into the far larger population that CPAP never held — and most published sleep apnea market…
Samsung Health AI Features vs. My Sleep Data: Six Weeks Trying to Get It Back
Here is the question I could not stop turning over, somewhere around the fourth night of sleeping in a watch: if I let Samsung Health AI features grade my sleep every night, whose sleep is it…
The 3 a.m. Question: When Sleep Patterns Are Worth Telling a Doctor About
At 3:07 in the morning you are awake, and the question arrives fully formed: is this a problem? Not the tiredness — you've made a kind of peace with the tiredness.
Insomnia Redefined: What a Sleep Clinician Told Me About My 41 Awake Minutes
At 2:40 on a Tuesday I drank a cortado — one shot, about 130 milligrams of caffeine — because the four-year-old had been up at 4:50. I went to bed at 10:50, fell asleep fast, surfaced once around 3.
The Breastfeeding Benefits That Survive a Randomized Trial
The largest randomized trial of infant feeding ever conducted found no effect on childhood obesity. None at six years, none at eleven, none at sixteen.
Daylight Saving Time Isn't the Problem. Dark Mornings Are.
Every March the coverage arrives on schedule. Heart attacks tick up in the days after the country springs forward.
Three IQ Points: What the Evidence on Breastfeeding Benefits and Brain Development Actually Shows
The number is 3.44. That is the IQ advantage usually attributed to breastfed children, and it is the single figure doing most of the work whenever breastfeeding benefits and brain development come up…
I Gave Myself Six Weeks of Permanent Daylight Saving Time. My Coffee Grinder Kept the Score.
On January 5, the sun comes up over Tyler at 7:26 in the morning. That is already late. Under permanent daylight saving time — the version of the clock Congress keeps almost passing — it would come up…
Noise-Induced Insomnia: If You Fall Back Asleep, Did the Noise Still Get You?
The bass starts around 11:40, and it is not, by any reasonable measure, loud. Maybe 35 decibels at your pillow — quieter than a refrigerator, quieter than rain on a window.
A Local Business Opening at 11 p.m.: Fourteen Nights of Guelph Late-Night Delivery, Timed and Measured
The line outside the new cookie counter on Wyndham started forming at 10:40 p.m. on a Friday — a local business opening timed, deliberately, for the hour when most kitchens in this city are already…