Sleep
Explore our latest articles on sleep to feed the curious you.
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
Sleep Algorithm 2.0 explained: Personalized sleep scoring
How Ultrahuman Ring AIR's new machine learning-trained sleep algorithm makes tracking more accurate and personalized
Jun 11, 2025
Shift Work PowerPlug: How to manage irregular sleep patterns
Introducing the Ultrahuman Ring AIR's Shift Work PowerPlug and how it helps shift workers maximize rest and recovery.
May 30, 2025
Why naps are the secret to living stronger, smarter, and longer
Why sleeping for 28 minutes can make you smarter, stronger – and live longer
May 22, 2025