Sleep tracking produced mixed results. Light sleep accuracy was average, while REM sleep tracking proved less convincing. For now, CIRQA's sleep tracking ranks as solid, but not among Garmin's best. Weightlifting remains a challenge, as is common with wrist-based optical sensors, which Horst attributes to wrist tension interfering with the sensor's signal. Horst plans to use a bicep-worn strap for this purpose, noting that this tends to be much more accurate than wrist measurements.