diff --git a/esphome/esp-reterminal-e1001.yaml b/esphome/esp-reterminal-e1001.yaml
index 4887053..8078320 100644
--- a/esphome/esp-reterminal-e1001.yaml
+++ b/esphome/esp-reterminal-e1001.yaml
@@ -1251,7 +1251,8 @@ interval:
 
 #:########################################################################################:#
 # MQTT COMMANDS:
-# Retained On/ON allows sleep; retained Off/OFF prevents sleep for OTA/development.
+# Retained ON allows sleep; retained OFF prevents sleep for OTA/development.
+# Payload matching is case-insensitive.
 # This extends common/mqtt_common.yaml with device-specific subscriptions.
 #:########################################################################################:#
 mqtt:
@@ -1259,24 +1260,33 @@ mqtt:
 
   on_message:
     - topic: "${mqtt_command_topic}/deepsleep"
-      payload: "On"
       then:
-        - script.execute: apply_sleep_allowed
-
-    - topic: "${mqtt_command_topic}/deepsleep"
-      payload: "ON"
-      then:
-        - script.execute: apply_sleep_allowed
-
-    - topic: "${mqtt_command_topic}/deepsleep"
-      payload: "Off"
-      then:
-        - script.execute: apply_sleep_prevented
-
-    - topic: "${mqtt_command_topic}/deepsleep"
-      payload: "OFF"
-      then:
-        - script.execute: apply_sleep_prevented
+        - if:
+            condition:
+              lambda: |-
+                std::string command = x;
+                for (char &character : command) {
+                  if (character >= 'A' && character <= 'Z') character += 'a' - 'A';
+                }
+                return command == "on";
+            then:
+              - script.execute: apply_sleep_allowed
+            else:
+              - if:
+                  condition:
+                    lambda: |-
+                      std::string command = x;
+                      for (char &character : command) {
+                        if (character >= 'A' && character <= 'Z') character += 'a' - 'A';
+                      }
+                      return command == "off";
+                  then:
+                    - script.execute: apply_sleep_prevented
+                  else:
+                    - logger.log:
+                        level: WARN
+                        format: "Ignoring invalid deep-sleep MQTT payload: %s"
+                        args: ["x.c_str()"]
 
 #:########################################################################################:#
 # DEEP SLEEP: