Wearable health trackers can provide useful data on sleep patterns, but they may inadvertently trigger “orthosomnia”—a preoccupation with achieving perfect sleep data that actually degrades sleep quality. While devices from companies like Apple, Garmin, and Fitbit offer insights into sleep stages and duration, clinical experts suggest these metrics should be viewed as general trends rather than diagnostic tools.
How do wearable sleep trackers work?
Most consumer-grade smartwatches and rings use actigraphy, which relies on an accelerometer to detect movement, combined with photoplethysmography (PPG) to measure heart rate and heart rate variability (HRV). According to the Sleep Foundation, these sensors estimate when a user is awake or asleep based on activity levels and physiological changes.
While these devices can distinguish between broad states of wakefulness and sleep, they struggle to perfectly replicate the accuracy of polysomnography (PSG)—the gold-standard sleep study performed in a clinical laboratory. A study published in the Journal of Clinical Sleep Medicine notes that while consumer devices are improving, they often have difficulty accurately identifying specific sleep stages, such as REM versus light sleep, compared to clinical EEG-based measurements.
Can tracking your sleep lead to anxiety?
The act of monitoring sleep metrics can sometimes become counterproductive. Researchers have identified a phenomenon known as “orthosomnia,” characterized by a compulsive desire to achieve “perfect” sleep scores as dictated by an app.
As reported by the American Academy of Sleep Medicine, patients who obsess over these metrics often experience increased sleep-onset latency—the time it takes to fall asleep—and heightened anxiety. When a user sees their device report a “poor” night of sleep, the resulting stress can create a feedback loop that makes future sleep cycles more difficult to attain. For those with existing sleep disorders, these devices may offer a false sense of security or, conversely, unnecessary alarm.
What should you prioritize instead of data?
Clinical guidelines from the National Heart, Lung, and Blood Institute suggest that how you feel during the day is a more accurate indicator of sleep quality than any smartwatch metric.
If you choose to use a wearable, experts recommend the following:
- Focus on trends: Look at your sleep quality over weeks or months, rather than obsessing over a single night’s score.
- Use as a guide, not a diagnosis: If a device consistently shows signs of breathing disturbances or severe sleep fragmentation, consult a primary care physician rather than self-diagnosing.
- Implement a “data detox”: If you find yourself checking your sleep score immediately upon waking, consider turning off notifications or removing the device at night for a trial period.
Ultimately, if you are waking up feeling refreshed and maintaining alertness throughout the day, your sleep is likely adequate regardless of what a wrist-worn device reports. If you experience persistent fatigue, daytime sleepiness, or difficulty falling asleep, professional evaluation is the only way to rule out underlying conditions like sleep apnea or chronic insomnia.
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