SLEEP ANALYSIS Count the lambs for you With Sleep Analysis, you can schedule your bedtime, detect snoring, track your sleep stages (awake, light, deep, REM) and discover your sleep type with 8 different animal sleep symbols. Samsung BioActive Sensor The powerful Samsung BioActive Sensor controls 3 sensors that allow you to measure your heart rate visually and electrically, and your body composition using Bioelectrical Impedance Analysis (BIA). Bioelectrical Impedance Analysis (BIA) Capture and track your body fat percentage (BIA) and skeletal muscle weight. This gives you feedback that can help you track progress towards a more conscious lifestyle ACU Quickly back on your wrist It only takes about 30 minutes to recharge an empty battery to 45%. The Galaxy Watch5 has a larger battery than its predecessors and a quick charge function that gets you back up and running in no time.