diff --git a/src/index.php b/src/index.php
index f788ac3..e14cbec 100755
--- a/src/index.php
+++ b/src/index.php
@@ -75,8 +75,13 @@ loadGivenParameters($activity);
 storeActivity($activity);
 
 // Handle sleep streak
-$startingHour = (int) date("H");
-if ($activity->title == "Sleeping" && $startingHour  > 18) {
+$tz = 'Europe/Berlin';
+$timestamp = $activity->startTime;
+$dt = new DateTime("now", new DateTimeZone($tz)); //first argument "must" be a string
+$dt->setTimestamp($timestamp); //adjust the object to correct timestamp
+
+$startingHour = (int) $dt->format('H');
+if ($activity->template == "sleeping" && $startingHour > 18) {
     markTodayAsSuccess("sleep");
 }