8 articles
Your Whoop or Oura measures movement, heart rate and temperature. What it does not measure: your hormones. The honest co...
Awake at three every night? Waking briefly is normal, staying awake is not. The causes, plus when this becomes a questio...
Sleep deprivation costs you muscle while cutting, raises your injury risk and makes you hungrier. The numbers from the r...
Your sleep stages in numbers: how long a cycle lasts, what percentage per stage is normal, and why your watch pie chart...
Deep sleep is the stage where your growth hormone peaks. How much you need, why it declines with age, and what actually...
Caffeine can improve your strength, endurance and focus. How much to take per kilo, when to take it and what in pre-work...
Better sleep pays off more than any supplement. What the science shows about sleep, performance and the blood values tha...
A week of poor sleep lowers your testosterone, raises your cortisol and worsens your insulin sensitivity. Here is how it...