A longitudinal study in Nature Medicine (2024) monitored 6,785 people for a median of 4.5 years using commercial wearables linked to electronic health records. Reduction in REM and deep sleep is inversely associated with onset of atrial fibrillation.
Bedroom of an Engadine chalet just before dawn: cold bluish light from the window, pale linen sheets, a smart ring and watch resting on the nightstand; no faces.
The heart's data hides in sleep
Every hour less of REM or deep sleep is a cardiovascular health marker. The All of Us Research Program study demonstrated this association is independent of other traditional risk factors, making sleep monitoring a first-line cardiological tool.
Macro detail of a wearable ring and a smartwatch recording sleep phases in low light; night-blue tones, soft reflections; no faces.
The numbers: a precise indicator
Each percentage increase in REM is associated with reduced incidence of atrial fibrillation (OR 0.86), atrial flutter (OR 0.78) and sinoatrial node dysfunction (OR 0.72).
Luminous chart of REM and deep-sleep phases projected on the dark wall of a premium clinical room; soft light, order; no faces.
A higher percentage of deep sleep is associated with reduced AF probability (OR 0.87) and lower major depressive disorder (OR 0.93).
Chalet window at dawn framing the snowy Engadine peaks seen from an unmade bed; cold natural light, stillness; no faces.
What this means for your Digital Twin
The Digital Twin monitors REM and deep sleep every night. If it detects a declining trend over 7+ consecutive days, it generates an alert the referring physician can evaluate — to intervene when the risk is still preventable.
Silent corridor of an Alpine clinic at dawn, warm materials (wood and stone) and soft light; a mood of clinical calm; no faces.
The advantage of longitudinal monitoring
Cardiovascular risk builds over months. The Digital Twin detects this trend over time, transforming daily data into a clinically relevant risk curve.
Bedroom of an Engadine chalet just before dawn: cold bluish light from the window, pale linen sheets, a smart ring and watch resting on the nightstand; no faces.
Brittain et al. — Nature Medicine, Vol. 30 (2024) — https://www.nature.com/articles/s41591-024-03155-8 · www.nature.com
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