Sleep
Explore our latest articles on sleep to feed the curious you.
How an inconsistent sleep schedule takes its toll on your body
Ultrahuman research suggests inconsistent sleep elevates heart rate and impacts recovery
May 06, 2026
Why waking up at 3 AM could be your metabolism – and how to change it
Updated: If you find yourself waking at 3AM regularly, it could be your metabolism. Here's what to watch out for
Jan 27, 2026
Ultrahuman-powered smart pillow shown to transform pro-gamers' sleep
The Tech Co Performance Pillow uses Ring AIR insights to promote REM sleep, reduce wake time, and help athletes get higher-quality rest
Sep 17, 2025
What is your sleep chronotype and how it affects productivity
Discover your chronotype — Bear, Wolf, Lion, or Dolphin — and learn how it shapes sleep, focus, diet, and health. Align your routine with your biology
Sep 02, 2025
How caffeine affects your sleep – and when you should stop drinking it
Discover how caffeine affects your sleep, from latency to REM disruption—plus science-backed tips for timing your intake without sacrificing rest.
Jul 11, 2025
Why sleep is the hardest Tour De France stage to win
How Team Cofidis uses Ultrahuman Ring AIR to maximize recovery during the Tour de France
Jul 08, 2025
Caffeine and adenosine: The reason behind the coffee crash
How caffeine affects adenosine signaling, sleep, and energy. Learn why crashes happen and how to reset your tolerance for better cognitive performance
Jun 20, 2025
5 ways to supercharge your deep sleep
Learn why deep sleep matters, how much you need, and 5 science-backed ways to improve it — even as you age.
Jun 17, 2025
Introducing Caffeine Window upgrade: Now with real-time tracking and logging
Caffeine Window got personal with effortless tagging, real-time body caffeine levels and adaptable cut-off times.
Jun 13, 2025