diff --git a/services/core/java/com/android/server/policy/PhoneWindowManager.java b/services/core/java/com/android/server/policy/PhoneWindowManager.java
index a148de6848d0b..9c780bb90b22c 100644
--- a/services/core/java/com/android/server/policy/PhoneWindowManager.java
+++ b/services/core/java/com/android/server/policy/PhoneWindowManager.java
@@ -1086,6 +1086,8 @@ public class PhoneWindowManager implements WindowManagerPolicy {
 
         final DreamManagerInternal dreamManagerInternal = getDreamManagerInternal();
         if (dreamManagerInternal == null || !dreamManagerInternal.canStartDreaming(isScreenOn)) {
+            Slog.d(TAG, "Can't start dreaming when attempting to dream from short power"
+                    + " press (isScreenOn=" + isScreenOn + ")");
             noDreamAction.run();
             return;
         }