diff --git a/custom_components/tibber_prices/coordinator/period_handlers/relaxation.py b/custom_components/tibber_prices/coordinator/period_handlers/relaxation.py
index 41c7aa5..2a73448 100644
--- a/custom_components/tibber_prices/coordinator/period_handlers/relaxation.py
+++ b/custom_components/tibber_prices/coordinator/period_handlers/relaxation.py
@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import logging
+from datetime import timedelta
 from typing import TYPE_CHECKING, Any
 
 if TYPE_CHECKING:
@@ -216,7 +217,9 @@ def group_periods_by_day(periods: list[dict]) -> dict[date, list[dict]]:
         current_date = start_date
         while current_date <= end_date:
             periods_by_day.setdefault(current_date, []).append(period)
-            # Move to next day
+            current_date = current_date + timedelta(days=1)
+
+    return periods_by_day
 
 
 def mark_periods_with_relaxation(