Performance of seven consumer sleep-tracking devices compared with polysomnography

Area of Science:

• Biomedical Engineering
• Sleep Science
• Wearable Technology

Background:

• Consumer sleep-tracking devices are increasingly advanced and popular.
• There is growing interest in their use as alternatives to traditional actigraphy.
• Validation against polysomnography (PSG) is crucial for clinical and research applications.

Purpose of the Study:

• To evaluate the performance of the latest consumer sleep-tracking devices.
• To compare their accuracy against standard actigraphy and polysomnography (PSG).
• To assess device reliability across different sleep conditions.

Main Methods:

• 34 healthy adults underwent three nights of laboratory sleep monitoring.
• Polysomnography (PSG) served as the gold standard.
• Actigraphy and several wearable/non-wearable consumer devices were simultaneously used.
• Sleep/wake and epoch-by-epoch agreement with PSG were analyzed.

Main Results:

• Most tested devices performed as well as or better than actigraphy for sleep/wake detection.
• Garmin devices showed poorer performance compared to actigraphy.
• High sensitivity (≥0.93) but low-to-medium specificity (0.18-0.54) was observed.
• Performance decreased with disrupted sleep; sleep stage accuracy was inconsistent.

Conclusions:

• Many consumer sleep-tracking devices demonstrate promising performance for sleep and wake detection.
• Most devices are comparable or superior to actigraphy in wake detection.
• Sleep stage assessment requires further investigation; consistency is lacking.
• Further validation in diverse populations and settings is recommended.