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The Journal

Better mornings, explained.

Short, honest reads on sleep, recovery and the science behind the earring. No listicles.

Product

Why Nurnex Core is free — and why it stays that way

Your data should not come with a monthly bill. Here is the business model that lets us say that out loud.

Aug 20, 2026 · 5 min read

Science

How we validate sleep staging against the lab

Polysomnography, epoch-by-epoch agreement, and the numbers we are comfortable printing.

Aug 6, 2026 · 8 min read

Training

Using Readiness to plan a training week

A coach's guide to reading HRV balance, resting heart rate and temperature before you decide to push.

Jul 24, 2026 · 6 min read

Women's health

What three temperature sensors can tell you about your cycle

The physiology behind period prediction, ovulation confirmation and phase-aware Readiness.

Jul 10, 2026 · 7 min read

Stress

Daytime Stress, explained without the jargon

Stressed, engaged, relaxed, restored: what the four states mean and what to do about them.

Jun 26, 2026 · 4 min read

Product

How we got to eight days of battery in 2.6 millimetres

Adaptive sampling, a custom power path, and the trade-offs we refused to make.

Jun 12, 2026 · 6 min read