Sleep & Recovery

Most adults spend roughly 13–23% of total sleep time in deep sleep, though the exact amount varies by age, activity level, and individual physiology. Tracking your own trend over time is more useful than comparing to a fixed target.

Heart rate variability (HRV) is the variation in time between consecutive heartbeats. Higher HRV generally reflects a body that is well-recovered and adapting well to stress, while a lower-than-usual HRV can be an early signal to take recovery easier.

Recovery Score combines several overnight signals — including HRV, resting heart rate, sleep quality, and respiratory rate — into a single daily indicator of how ready your body is to take on stress or training.

Feeling tired despite "enough" hours in bed is usually about sleep quality, not just duration — fragmented sleep, late caffeine, inconsistent bedtimes, or elevated stress can all reduce how restorative your sleep actually is.

Wearables don't change your sleep directly, but continuous tracking of sleep stages, HRV, and recovery trends can help you identify patterns and habits worth adjusting — turning guesswork into informed, data-backed decisions.

Consumer sleep tracking is designed to estimate sleep stages and trends for wellness purposes using movement and physiological signals. It is not a diagnostic or medical device, and results are most useful when read as trends over time rather than single-night data.

Intense training increases the body's recovery demand, and many people benefit from slightly more sleep or an earlier bedtime after hard sessions. Watching your Recovery Score and HRV trend can help you judge how much extra rest you actually need.

HRV is most useful as a morning, resting-state trend measured consistently over days and weeks, rather than a single reading. Looking at your 7- and 30-day trend line gives a clearer picture than any one data point.