diff --git a/backend/placeholder_resolver.py b/backend/placeholder_resolver.py
index efb8835..a8e3f88 100644
--- a/backend/placeholder_resolver.py
+++ b/backend/placeholder_resolver.py
@@ -347,7 +347,8 @@ def get_sleep_avg_quality(profile_id: str, days: int = 7) -> str:
         for row in rows:
             segments = row['sleep_segments']
             if segments:
-                deep_rem_min = sum(s.get('duration_min', 0) for s in segments if s.get('stage') in ['Deep', 'REM'])
+                # Note: stages are stored lowercase (deep, rem, light, awake)
+                deep_rem_min = sum(s.get('duration_min', 0) for s in segments if s.get('stage') in ['deep', 'rem'])
                 total_min = sum(s.get('duration_min', 0) for s in segments)
                 if total_min > 0:
                     quality_pct = (deep_rem_min / total_min) * 100