diff --git a/src/globals.h b/src/globals.h
index c02b33b..f7ae102 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -54,8 +54,13 @@ void writeFile(fs::FS &fs, const char * path, const char * message){
 
 unsigned long lastStart = 0;
 
+unsigned long lastInteraction =  0;
+
 uint8_t buttontoignore = 0;
 
 const int startDelay = 250;
 
+// wait until deep sleep:
+const long sleepDelay = 1800000;
+
 #endif
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 1de5cba..e4b7ccf 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -236,11 +236,13 @@ void togglePlayPause()
   {
     playNextMp3();
   }
+  lastInteraction = millis();
 }
 
 void next()
 {
   playNextMp3();
+  lastInteraction = millis();
 }
 
 void audio_eof_mp3(const char *info)
@@ -262,12 +264,14 @@ void readRFID()
   String uidString = getRFIDString(rfid.uid.uidByte);
   Serial.println(uidString);
   playSongByRFID(uidString);
+  lastInteraction = millis();
 }
 
 void setup()
 {
   // put your setup code here, to run once:
   Serial.begin(115200);
+  
 
   pinMode(BTN_START_STOP, INPUT_PULLUP);
   pinMode(BTN_NEXT, INPUT_PULLUP);
@@ -282,7 +286,8 @@ void setup()
   deactivateRFID();
   activateSD();
 
-
+  //deep sleep wakeup
+  esp_sleep_enable_ext0_wakeup((gpio_num_t)BTN_START_STOP, LOW);
 
   Serial.print("Initializing SD card...");
 
@@ -383,6 +388,7 @@ void setup()
       &RfidTask,  /* Task handle. */
       0);         /* Core where the task should run */
 
+  lastInteraction = millis();
   Serial.println("initialization done.");
 }
 
@@ -400,6 +406,7 @@ void named_song_action(AsyncWebServerRequest *request)
       playSongByName(p->value());
     }
   }
+  lastInteraction = millis();
   request->send_P(200, "text/plain", "ok");
 }
 
@@ -417,6 +424,7 @@ void progress_action(AsyncWebServerRequest *request)
       audio.setAudioPlayPosition(atoi(p->value().c_str()));
     }
   }
+  lastInteraction = millis();
   request->send_P(200, "text/plain", "ok");
 }
 
@@ -434,6 +442,7 @@ void volume_action(AsyncWebServerRequest *request)
       audio.setVolume(atoi(p->value().c_str()));
     }
   }
+  lastInteraction = millis();
   request->send_P(200, "text/plain", "ok");
 }
 
@@ -463,6 +472,15 @@ void loop()
     start();
   }
 
+  // send device to sleep:
+  long now = millis();
+  if (now - lastInteraction > sleepDelay) {
+    Serial.println("entering deep sleep...");
+    deactivateRFID();
+    deactivateSD();
+    esp_deep_sleep_start();
+  }
+
   if (asyncTogglePlayPause)
   {
     asyncTogglePlayPause = false;
@@ -526,6 +544,7 @@ boolean buttonPressed(const uint8_t pin)
       lastStart = now;
       Serial.println("button pressed.");
       buttontoignore = pin;
+      lastInteraction = now;
       return true;
     }
   } else if (digitalRead(pin) == HIGH && buttontoignore == pin) {