Sleep
The 90-Minute Sleep Cycle Rule Is Mostly Wrong
Set your alarm for a multiple of ninety minutes and you will wake up refreshed — so the advice goes. The number is an average of a distribution nobody bothered to look at.
Sleep
The highest-leverage intervention nobody wants to hear about.
Articles filed under Sleep
Sleep
I Tracked 400 Nights of Sleep. Five Things Moved the Needle
Fourteen interventions, one spreadsheet, four hundred nights. Most of what I tested did nothing measurable. Here is the short list that survived.
Sleep
Your Bedroom Is Probably Too Warm
Of all the sleep variables you can control, ambient temperature is the cheapest, the best understood, and the one most people have set wrong.
Sleep
Blue Light Blockers: Sorting the Evidence From the Marketing
The photoreceptor biology is genuinely elegant. The consumer product built on top of it is a much weaker proposition than the packaging suggests.
Sleep
Why Your Sleep Score Is Not a Diagnosis
Wearables are good at some sleep questions and poor at others. Knowing which is which turns a source of anxiety back into a useful instrument.
Sleep
Morning Light Is the Cheapest Circadian Intervention You Are Not Using
It costs nothing, takes ten minutes, and has better mechanistic support than most of what gets sold to people with sleep problems.