smart metric
Awake Time (WASO) (Coming Soon)
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Description
Awake Time (WASO)—Wake After Sleep Onset—is the total time you spend awake after initially falling asleep. Wearables estimate this from movement and heart-rate patterns and typically report it as minutes per night. Lower WASO generally means more consolidated sleep; higher WASO suggests more fragmented sleep.
Why it matters
Even if total time in bed is long, frequent awakenings can reduce sleep efficiency and leave you feeling less restored. WASO is often one of the most practical metrics for tracking sleep maintenance insomnia or sleep fragmentation over time.
Common reasons WASO runs higher
Alcohol (more awakenings in the second half of the night)
Stress/anxiety, rumination
Caffeine too late in the day
Noisy/light/too-warm sleep environment
Needing to urinate at night
Sleep-disordered breathing (snoring, apnea) or restless legs
How to use it (practical)
Track a 1–2 week trend and pair it with sleep duration and sleep efficiency. If WASO is persistently high, the biggest levers are often earlier alcohol cutoff, cooler/darker room, consistent schedule, and screening for snoring/apnea when relevant.
Educational only, not medical advice. If awakenings are frequent and persistent, or there is loud snoring/daytime sleepiness, consider evaluation for sleep disorders.
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