diff --git a/README.md b/README.md
index bcf4f367..0c474ac6 100644
--- a/README.md
+++ b/README.md
@@ -518,7 +518,7 @@ Send for example `83` `86` as Downlink on Port 2 to get battery status and time/
 0x19 set sleep cycle
 
 	bytes 1..2 = device sleep cycle in seconds/10 (MSB), 1 ... 255
-	e.g. {0x04, 0xB0} -> device sleeps 20 minutes after each send cycle [default = 0]
+	e.g. {0x04, 0xB0} -> device sleeps 200 minutes after each send cycle [default = 0]
 
 0x20 load device configuration
 
diff --git a/include/lorawan.h b/include/lorawan.h
index 32ddc4ba..a8e7e588 100644
--- a/include/lorawan.h
+++ b/include/lorawan.h
@@ -25,7 +25,7 @@ extern char lmic_event_msg[LMIC_EVENTMSG_LEN]; // display buffer
 
 esp_err_t lmic_init(void);
 void lora_setupForNetwork(bool preJoin);
-void SaveLMICToRTC(int deepsleep_sec);
+void SaveLMICToRTC(uint32_t deepsleep_sec);
 void LoadLMICFromRTC();
 void lmictask(void *pvParameters);
 void gen_lora_deveui(uint8_t *pdeveui);
diff --git a/include/reset.h b/include/reset.h
index 8f700769..c82ede9f 100644
--- a/include/reset.h
+++ b/include/reset.h
@@ -14,8 +14,7 @@
 void reset_rtc_vars(void);
 void do_reset(bool warmstart);
 void do_after_reset(void);
-void enter_deepsleep(const uint64_t wakeup_sec = 60,
-                     const gpio_num_t wakeup_gpio = GPIO_NUM_MAX);
+void enter_deepsleep(const uint32_t wakeup_sec, const gpio_num_t wakeup_gpio);
 unsigned long long uptime(void);
 
 enum runmode_t {
diff --git a/src/irqhandler.cpp b/src/irqhandler.cpp
index 87f6c7bd..477c70b5 100644
--- a/src/irqhandler.cpp
+++ b/src/irqhandler.cpp
@@ -76,9 +76,9 @@ void irqHandler(void *pvParameters) {
       // goto sleep if we have a sleep cycle
       if (cfg.sleepcycle)
 #ifdef HAS_BUTTON
-        enter_deepsleep(cfg.sleepcycle * 10, (gpio_num_t)HAS_BUTTON);
+        enter_deepsleep(cfg.sleepcycle * 10UL, (gpio_num_t)HAS_BUTTON);
 #else
-        enter_deepsleep(cfg.sleepcycle * 10);
+        enter_deepsleep(cfg.sleepcycle * 10UL, GPIO_NUM_MAX);
 #endif
     }
   } // for
diff --git a/src/lorawan.cpp b/src/lorawan.cpp
index cda3a2d8..23c73ebf 100644
--- a/src/lorawan.cpp
+++ b/src/lorawan.cpp
@@ -501,7 +501,7 @@ bool ttn_rtc_restore() {
 // following code includes snippets taken from
 // https://github.com/JackGruber/ESP32-LMIC-DeepSleep-example/blob/master/src/main.cpp
 
-void SaveLMICToRTC(int deepsleep_sec) {
+void SaveLMICToRTC(uint32_t deepsleep_sec) {
   // ESP32 can't track millis during DeepSleep and no option to advance
   // millis after DeepSleep. Therefore reset DutyCyles before saving LMIC struct
 
diff --git a/src/power.cpp b/src/power.cpp
index 61f7e27d..ab137ea2 100644
--- a/src/power.cpp
+++ b/src/power.cpp
@@ -57,7 +57,7 @@ void AXP192_powerevent_IRQ(void) {
 #ifdef HAS_BUTTON
   // short press -> esp32 deep sleep mode, must be exited by user button
   if (pmu.isPekeyShortPressIrq())
-    enter_deepsleep(0, HAS_BUTTON);
+    enter_deepsleep(0UL, HAS_BUTTON);
 #endif
 
   pmu.clearIrqStatus();
diff --git a/src/reset.cpp b/src/reset.cpp
index 9c58efb8..32843f0a 100644
--- a/src/reset.cpp
+++ b/src/reset.cpp
@@ -84,7 +84,7 @@ void do_after_reset(void) {
   }
 }
 
-void enter_deepsleep(const uint64_t wakeup_sec, gpio_num_t wakeup_gpio) {
+void enter_deepsleep(const uint32_t wakeup_sec, gpio_num_t wakeup_gpio) {
   ESP_LOGI(TAG, "Preparing to sleep...");
 
   RTC_runmode = RUNMODE_SLEEP;