All articles

Ultradian rhythm: the 90-minute energy cycles behind your focus

Male menopause (andropause): do men go through menopause?

Is it bad to sleep with a fan on? What the research says

Sleep environment

Does nicotine raise blood pressure? What happens to your pressure and pulse

Sinus rhythm: what it means on your ECG and your Apple Watch

Hot flashes and night sweats after a hysterectomy

Menopause after a hysterectomy when your ovaries were left in

Why your sleep score and how you feel disagree — and which one to trust

When tracking makes it worse: orthosomnia and chronic illness

What's a normal resting heart rate when you have a chronic illness?

Resting heart rate

Two people standing together in a softly lit doorway at dusk, looking out at a blue landscape.

Using Migraine Buddy and a nervous-system tracker together: the diary and the layer underneath it

A little festival train strung with lights moving through a blue park at dusk, its carriages in a row.

Migraine tracker apps compared: what each one actually measures, and what none of them see