diff --git a/common.mk b/common.mk
index de1c6c36..fa31b3c4 100644
--- a/common.mk
+++ b/common.mk
@@ -10,6 +10,7 @@ SRC +=	$(COMMON_DIR)/host.c \
 	$(COMMON_DIR)/print.c \
 	$(COMMON_DIR)/debug.c \
 	$(COMMON_DIR)/bootloader.c \
+	$(COMMON_DIR)/suspend.c \
 	$(COMMON_DIR)/util.c
 
 
@@ -58,6 +59,7 @@ endif
 ifdef SLEEP_LED_ENABLE
     SRC += $(COMMON_DIR)/sleep_led.c
     OPT_DEFS += -DSLEEP_LED_ENABLE
+    OPT_DEFS += -DNO_SUSPEND_POWER_DOWN
 endif
 
 
diff --git a/common/command.c b/common/command.c
index cb98e1d5..b2933388 100644
--- a/common/command.c
+++ b/common/command.c
@@ -28,6 +28,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "bootloader.h"
 #include "layer_switch.h"
 #include "eeconfig.h"
+#include "sleep_led.h"
+#include "led.h"
 #include "command.h"
 
 #ifdef MOUSEKEY_ENABLE
@@ -152,6 +154,12 @@ static bool command_common(uint8_t code)
 {
     static host_driver_t *host_driver = 0;
     switch (code) {
+        case KC_Z:
+            // test breathing sleep LED
+            print("Sleep LED test\n");
+            sleep_led_toggle();
+            led_set(host_keyboard_leds());
+            break;
 #ifdef BOOTMAGIC_ENABLE
         case KC_E:
             print("eeprom config\n");
diff --git a/common/sleep_led.h b/common/sleep_led.h
index aebdbeaa..6bdcf558 100644
--- a/common/sleep_led.h
+++ b/common/sleep_led.h
@@ -1,10 +1,21 @@
 #ifndef SLEEP_LED_H
 #define SLEEP_LED_H
 
-#define NO_SUSPEND_POWER_DOWN
+
+#ifdef SLEEP_LED_ENABLE
 
 void sleep_led_init(void);
 void sleep_led_enable(void);
 void sleep_led_disable(void);
+void sleep_led_toggle(void);
+
+#else
+
+#define sleep_led_init()
+#define sleep_led_enable()
+#define sleep_led_disable()
+#define sleep_led_toggle()
+
+#endif
 
 #endif
diff --git a/common/suspend.c b/common/suspend.c
new file mode 100644
index 00000000..6029fe7f
--- /dev/null
+++ b/common/suspend.c
@@ -0,0 +1,70 @@
+#include "suspend.h"
+#include "matrix.h"
+#include "action.h"
+
+
+void suspend_power_down(void)
+{
+#ifndef NO_SUSPEND_POWER_DOWN
+    // Enable watchdog to wake from MCU sleep
+    cli();
+    wdt_reset();
+
+    // Watchdog Interrupt and System Reset Mode
+    //wdt_enable(WDTO_1S);
+    //WDTCSR |= _BV(WDIE);
+    
+    // Watchdog Interrupt Mode
+    wdt_intr_enable(WDTO_120MS);
+    
+    // TODO: more power saving
+    // See PicoPower application note
+    // - I/O port input with pullup
+    // - prescale clock
+    // - BOD disable
+    // - Power Reduction Register PRR
+    // sleep in power down mode
+    set_sleep_mode(SLEEP_MODE_PWR_DOWN);
+    sleep_enable();
+    sei();
+    sleep_cpu();
+    sleep_disable();
+
+    // Disable watchdog after sleep
+    wdt_disable();
+#endif
+}
+
+bool suspend_wakeup_condition(void)
+{
+    matrix_scan();
+    for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
+        if (matrix_get_row(r)) return true;
+    }
+    return false;
+}
+
+// run immediately after wakeup
+void suspend_wakeup_init(void)
+{
+    // clear matrix and keyboard state
+    matrix_init();
+    clear_keyboard();
+}
+
+#ifndef NO_SUSPEND_POWER_DOWN
+/* watchdog timeout */
+ISR(WDT_vect)
+{
+    /* wakeup from MCU sleep mode */
+/*
+    // blink LED
+    static uint8_t led_state = 0;
+    static uint8_t led_count = 0;
+    led_count++;
+    if ((led_count & 0x07) == 0) {
+        led_set((led_state ^= (1<<USB_LED_CAPS_LOCK)));
+    }
+*/
+}
+#endif
diff --git a/common/suspend.h b/common/suspend.h
new file mode 100644
index 00000000..1c1e41ac
--- /dev/null
+++ b/common/suspend.h
@@ -0,0 +1,32 @@
+#ifndef SUSPEND_H
+#define SUSPEND_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/sleep.h>
+#include <avr/wdt.h>
+#include <avr/interrupt.h>
+
+
+#define wdt_intr_enable(value)   \
+__asm__ __volatile__ (  \
+    "in __tmp_reg__,__SREG__" "\n\t"    \
+    "cli" "\n\t"    \
+    "wdr" "\n\t"    \
+    "sts %0,%1" "\n\t"  \
+    "out __SREG__,__tmp_reg__" "\n\t"   \
+    "sts %0,%2" "\n\t" \
+    : /* no outputs */  \
+    : "M" (_SFR_MEM_ADDR(_WD_CONTROL_REG)), \
+    "r" (_BV(_WD_CHANGE_BIT) | _BV(WDE)), \
+    "r" ((uint8_t) ((value & 0x08 ? _WD_PS3_MASK : 0x00) | \
+        _BV(WDIE) | (value & 0x07)) ) \
+    : "r0"  \
+)
+
+
+void suspend_power_down(void);
+bool suspend_wakeup_condition(void);
+void suspend_wakeup_init(void);
+
+#endif
diff --git a/protocol/lufa/lufa.c b/protocol/lufa/lufa.c
index 127dece5..7c707209 100644
--- a/protocol/lufa/lufa.c
+++ b/protocol/lufa/lufa.c
@@ -36,20 +36,18 @@
   this software.
 */
 
-#include <avr/sleep.h>
-#include <avr/wdt.h>
 #include "report.h"
 #include "host.h"
 #include "host_driver.h"
 #include "keyboard.h"
 #include "action.h"
-#include "matrix.h"
 #include "led.h"
 #include "sendchar.h"
 #include "debug.h"
 #ifdef SLEEP_LED_ENABLE
 #include "sleep_led.h"
 #endif
+#include "suspend.h"
 
 #include "descriptor.h"
 #include "lufa.h"
@@ -170,9 +168,7 @@ void EVENT_USB_Device_Suspend()
 
 void EVENT_USB_Device_WakeUp()
 {
-    // initialize
-    matrix_init();
-    clear_keyboard();
+    suspend_wakeup_init();
 
 #ifdef SLEEP_LED_ENABLE
     sleep_led_disable();
@@ -503,32 +499,6 @@ static void SetupHardware(void)
     USB_Device_EnableSOFEvents();
 }
 
-
-static bool wakeup_condition(void)
-{
-    matrix_scan();
-    for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
-        if (matrix_get_row(r)) return true;
-    }
-    return false;
-}
-
-#define wdt_intr_enable(value)   \
-__asm__ __volatile__ (  \
-    "in __tmp_reg__,__SREG__" "\n\t"    \
-    "cli" "\n\t"    \
-    "wdr" "\n\t"    \
-    "sts %0,%1" "\n\t"  \
-    "out __SREG__,__tmp_reg__" "\n\t"   \
-    "sts %0,%2" "\n\t" \
-    : /* no outputs */  \
-    : "M" (_SFR_MEM_ADDR(_WD_CONTROL_REG)), \
-    "r" (_BV(_WD_CHANGE_BIT) | _BV(WDE)), \
-    "r" ((uint8_t) ((value & 0x08 ? _WD_PS3_MASK : 0x00) | \
-        _BV(WDIE) | (value & 0x07)) ) \
-    : "r0"  \
-)
-
 int main(void)  __attribute__ ((weak));
 int main(void)
 {
@@ -541,42 +511,10 @@ int main(void)
     sei();
 
     while (1) {
-        // while suspend
         while (USB_DeviceState == DEVICE_STATE_Suspended) {
-#ifndef NO_SUSPEND_POWER_DOWN
-            // Enable watchdog to wake from MCU sleep
-            cli();
-            wdt_reset();
-
-            // Watchdog Interrupt and System Reset Mode
-            //wdt_enable(WDTO_1S);
-            //WDTCSR |= _BV(WDIE);
-            
-            // Watchdog Interrupt Mode
-            wdt_intr_enable(WDTO_120MS);
-            
-            // TODO: more power saving
-            // See PicoPower application note
-            // - I/O port input with pullup
-            // - prescale clock
-            // - BOD disable
-            // - Power Reduction Register PRR
-            // sleep in power down mode
-            set_sleep_mode(SLEEP_MODE_PWR_DOWN);
-            sleep_enable();
-            sei();
-            sleep_cpu();
-            sleep_disable();
-
-            // Disable watchdog after sleep
-            wdt_disable();
-#endif
-
-            // Send request of USB Wakeup from Suspend to host
-            if (USB_Device_RemoteWakeupEnabled) {
-                if (wakeup_condition()) {
+            suspend_power_down();
+            if (USB_Device_RemoteWakeupEnabled && suspend_wakeup_condition()) {
                     USB_Device_SendRemoteWakeup();
-                }
             }
         }
 
@@ -587,20 +525,3 @@ int main(void)
 #endif
     }
 }
-
-#ifndef NO_SUSPEND_POWER_DOWN
-/* watchdog timeout */
-ISR(WDT_vect)
-{
-    /* wakeup from MCU sleep mode */
-/*
-    // blink LED
-    static uint8_t led_state = 0;
-    static uint8_t led_count = 0;
-    led_count++;
-    if ((led_count & 0x07) == 0) {
-        led_set((led_state ^= (1<<USB_LED_CAPS_LOCK)));
-    }
-*/
-}
-#endif
diff --git a/protocol/pjrc/main.c b/protocol/pjrc/main.c
index 776bfee9..5f15dbf8 100644
--- a/protocol/pjrc/main.c
+++ b/protocol/pjrc/main.c
@@ -31,10 +31,7 @@
 #include "print.h"
 #include "debug.h"
 #include "util.h"
-#include "bootloader.h"
-#ifdef PS2_MOUSE_ENABLE
-#   include "ps2_mouse.h"
-#endif
+#include "suspend.h"
 #include "host.h"
 #include "pjrc.h"
 
@@ -55,7 +52,17 @@ int main(void)
 
     keyboard_init();
     host_set_driver(pjrc_driver());
+#ifdef SLEEP_LED_ENABLE
+    sleep_led_init();
+#endif
     while (1) {
-       keyboard_task(); 
+        while (suspend) {
+            suspend_power_down();
+            if (remote_wakeup && suspend_wakeup_condition()) {
+                usb_remote_wakeup();
+            }
+        }
+
+        keyboard_task(); 
     }
 }
diff --git a/protocol/pjrc/usb.c b/protocol/pjrc/usb.c
index f4c6f81f..a9fbc463 100644
--- a/protocol/pjrc/usb.c
+++ b/protocol/pjrc/usb.c
@@ -33,6 +33,8 @@
 #include "usb_extra.h"
 #include "print.h"
 #include "util.h"
+#include "sleep_led.h"
+#include "suspend.h"
 
 
 /**************************************************************************
@@ -595,7 +597,8 @@ void usb_init(void)
         USB_CONFIG();				// start USB clock
         UDCON = 0;				// enable attach resistor
 	usb_configuration = 0;
-        UDIEN = (1<<EORSTE)|(1<<SOFE)|(1<<SUSPE);
+        suspend = false;
+        UDIEN = (1<<EORSTE)|(1<<SOFE)|(1<<SUSPE)|(1<<WAKEUPE);
 	sei();
 }
 
@@ -631,9 +634,23 @@ ISR(USB_GEN_vect)
 
         intbits = UDINT;
         UDINT = 0;
-        if (intbits & (1<<SUSPI)) {
+        if ((intbits & (1<<SUSPI)) && (UDIEN & (1<<SUSPE)) && usb_configuration) {
+#ifdef SLEEP_LED_ENABLE
+            sleep_led_enable();
+#endif
+            UDIEN &= ~(1<<SUSPE);
+            UDIEN |= (1<<WAKEUPE);
             suspend = true;
-        } else {
+        }
+        if ((intbits & (1<<WAKEUPI)) && (UDIEN & (1<<WAKEUPE)) && usb_configuration) {
+            suspend_wakeup_init();
+#ifdef SLEEP_LED_ENABLE
+            sleep_led_disable();
+#endif
+            led_set(host_keyboard_leds());
+
+            UDIEN |= (1<<SUSPE);
+            UDIEN &= ~(1<<WAKEUPE);
             suspend = false;
         }
         if (intbits & (1<<EORSTI)) {