Portrait of Megan Caldwell, JavaSleep contributor
JavaSleep Contributor

Megan Caldwell

48 pieces published
A photorealistic overhead still life on a hotel bed's white duvet at night: an…
CPAP September 2026 · 11 min

CPAP Travel Logistics: What Five Nights Without the Machine Actually Do

The machine is about the size of a paperback. With the hose, the mask, and the power brick, it adds maybe three pounds to a suitcase you have already zipped twice.

By Megan Caldwell · Read →
A single high-end multisport GPS watch resting alone on a felt-topped hotel function-room table…
Sleep Tracking August 2026 · 8 min

The Garmin Fenix 9 Announcement, Judged on One Feature: Does It Actually Know When You Should Stop Drinking Coffee?

The Garmin Fenix 9 announcement arrived as a fifteen-minute pre-recorded video at 9 a.m. Eastern, with no press embargo call, no venue, and no stage — followed by four hours in a hotel function room…

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A photorealistic wide-angle photograph of a two-person tent glowing warm amber from within, pitched…
Sleep August 2026 · 10 min

Smartwatch review: nine nights in the Wind Rivers finding out whether sleep tracking is really what kills your battery

The question that produced this smartwatch review is narrower than the one most reviews answer. Not "how long does the battery last" — every spec sheet has a number for that, and every number is…

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A photorealistic overhead still-life photograph taken from directly above a rumpled queen bed at…
CPAP August 2026 · 6 min

Sixty Nights, Three Masks: What CPAP Adherence and Stigma Actually Look Like at 34

The advice is compact enough to fit on an index card: the machine works, so wear the machine, and if you aren't wearing it, the thing in your way is embarrassment.

By Megan Caldwell · Read →
A close-up profile portrait of a long-distance runner mid-stride on an asphalt path at…
Sleep August 2026 · 12 min

Four Bone Conduction Headphones, 136 Miles, and the 11 Minutes I Didn't See Coming

Thirty-eight percent. That's the cut on the Shokz OpenRun as I file this — $129.95 down to $79.95 — and by my own tracking it's the lowest that model has gone in fourteen months, Black Friday…

By Megan Caldwell · Read →
A stripped institutional twin XL mattress alone on a bare steel dorm bed frame…
Bedding August 2026 · 10 min

Do Dorm Mattress Toppers Actually Fix Anything? Four of Them, One Institutional Twin XL, Six Weeks

The question arrives every August, usually from a parent, almost never in front of the student: do mattress toppers actually do anything on a dorm bed, or are they a checklist item that exists because…

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A tight macro photograph of a modern CPAP machine sitting alone on a polished…
CPAP August 2026 · 6 min

What ResMed Quarterly Earnings Reveal About Pricing Power in a Market That Isn't Supposed to Have Any

The most interesting number in a ResMed quarterly earnings release is not revenue growth. It is the gross margin — and the counterintuitive claim is this: ResMed has spent the last two years raising…

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A stopped bullet train at a Japanese platform in the blue pre-dawn light, photographed…
Sleep Apnea August 2026 · 12 min

How Japan Wrote Sleep Apnea and Traffic Safety Into Criminal Law

On the morning of February 26, 2003, a Hikari bullet train running toward Okayama covered roughly 26 kilometers — about eight minutes — with no one awake at the controls.

By Megan Caldwell · Read →
A photorealistic overhead shot of a rumpled white bed at dawn, empty and unmade…
Sleep July 2026 · 6 min

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…

By Megan Caldwell · Read →