The Verdict

The ultimate "set it and forget it" sleep and HRV tracker. Place it under your mattress and never think about it again. Popular with serious athletes and biohackers who want clinical-grade overnight data without wearing anything.

Pros

Zero-effort tracking (nothing to wear)
Clinical-grade accuracy
Continuous all-night monitoring
No charging or batteries

Cons

Only tracks while in bed
No daytime or workout data
Partner movement can affect readings
Requires power outlet near bed

Ballistocardiography (BCG)

Unlike wearables that use optical sensors, Emfit detects the mechanical movements of your heart and breathing through the mattress. This ballistocardiography method is highly accurate for resting measurements and captures HRV throughout your entire sleep period.

Sleep Recovery Analysis

Emfit provides detailed recovery scores based on HRV, heart rate, breathing rate, and sleep quality. It tracks autonomic nervous system balance and shows how well you recovered overnight—ideal for optimizing training loads.

For Athletes and Biohackers

Many professional athletes and sports teams use Emfit for its accuracy and zero-compliance requirement. You can't forget to charge it or wear it—it just works every night. The web dashboard provides detailed trends and exportable data for analysis.