The physiological signatures of low energy availability show up in HRV, resting heart rate, sleep, body mass, and menstrual function. Each signal is real and each has significant limits.
A 75 on Oura is not a 75 on Garmin. Here's what each sleep score actually measures, which factors predict how you feel, and why consistency matters more than any single number.
Your wearable data contains a hidden signal: the ultradian rhythm. We're building a system that reads it — predicting your best focus windows from sleep data, then refining in real-time with a heart rate monitor.
Every major wearable now has an AI assistant. We asked all three to compare a week of sleep data. The difference in depth reveals a fundamental architectural gap.
Trying to choose between Oura and WHOOP? Here's the practical difference in sleep tracking, HRV, recovery, workouts, battery life, and who each device is actually best for.