Sleep
Sleep is the nightly repair cycle that shapes mood, memory, and metabolism — find essays on insomnia, sleep hygiene, REM cycles, and honest mattress notes.
One Espresso, One Night, One Number: How to Read Health Trends Without a Lab
On a Tuesday in February I drank a double espresso at 4:12 p.m. — call it 150 milligrams of caffeine — specifically because I wanted to catch my own sleep in the act of falling apart.
What the Fecal Transplant Insomnia Trial Actually Showed — and What Happened When I Tried the Grocery-Store Version
The number that got my attention was fourteen. That's roughly how many percentage points of sleep efficiency a small randomized trial reported gaining in adults with chronic insomnia after a course of…
The Two Hours in the Middle: What the Biphasic Sleep Study Actually Measured
The number is two hours. In 1992, the psychiatrist Thomas Wehr ran an experiment that still anchors almost every serious conversation about biphasic sleep.
Sleep Apnea Symptoms: Why the Loudest Sign Is the One You Can't Hear
The most useful symptom of sleep apnea is not the sound you make at night. It's the person you become during the day. That runs against how the condition gets talked about.
How Much REM Sleep Do You Actually Need? A Night, Stage by Stage
Your sleep tracker probably told you a number last night: something like 20 to 25 percent REM. Maybe it flagged it as low and suggested you "prioritize recovery." That percentage is roughly right for…
Sexsomnia Is a Sleep Disorder, Not a Punchline
A person can initiate sex while asleep, complete it, and wake with no memory of any of it. Not a fantasy, not a euphemism, not an excuse cooked up the morning after.