Metrics
Sleep Tracking
Last updated: December 2024
CardioMood provides comprehensive sleep tracking to help you understand and improve your rest.
How Sleep Tracking Works
CardioMood uses PPG sensors to detect: - Heart rate changes during sleep - HRV patterns that indicate sleep stages - Movement and restlessness
Sleep Stages
**Light Sleep** - Transition between wake and deeper sleep - Body begins to relax - Easy to wake from this stage
**Deep Sleep** - Physical restoration occurs - Immune system strengthening - Most difficult to wake from
**REM Sleep** - Brain is highly active - Dreams occur - Memory consolidation
Sleep Metrics
- **Total Sleep Time**: Hours actually asleep
- **Sleep Efficiency**: Time asleep / time in bed
- **Sleep Stages**: Breakdown by stage
- **Overnight HRV**: Recovery indicator
- **Sleep Score**: Overall quality (0-100)