diff --git a/BLEUnlock/AppDelegate.swift b/BLEUnlock/AppDelegate.swift
index 4ee9c91..95d0522 100644
--- a/BLEUnlock/AppDelegate.swift
+++ b/BLEUnlock/AppDelegate.swift
@@ -16,6 +16,7 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
     let unlockRSSIMenu = NSMenu()
     let timeoutMenu = NSMenu()
     let lockDelayMenu = NSMenu()
+    let sleepRSSIMenu = NSMenu()
     var deviceDict: [UUID: NSMenuItem] = [:]
     var monitorMenuItem : NSMenuItem?
     let prefs = UserDefaults.standard
@@ -50,6 +51,14 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
                     item.state = .off
                 }
             }
+        } else if menu == sleepRSSIMenu {
+            for item in menu.items {
+                if item.tag == ble.sleepRSSI {
+                    item.state = .on
+                } else {
+                    item.state = .off
+                }
+            }
         } else if menu == timeoutMenu {
             for item in menu.items {
                 if item.tag == Int(ble.signalTimeout) {
@@ -71,9 +80,11 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
 
     func validateMenuItem(_ menuItem: NSMenuItem) -> Bool {
         if menuItem.menu == lockRSSIMenu {
-            return menuItem.tag <= ble.unlockRSSI
+            return menuItem.tag < ble.unlockRSSI
         } else if menuItem.menu == unlockRSSIMenu {
-            return menuItem.tag >= ble.lockRSSI
+            return menuItem.tag > ble.lockRSSI
+        } else if menuItem.menu == sleepRSSIMenu {
+            return menuItem.tag < ble.lockRSSI || menuItem.tag == ble.LOCK_DISABLED
         }
         return true
     }
@@ -234,6 +245,13 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
                 tryUnlockScreen()
             }
         } else {
+            if (!displaySleep && ble.sleepRSSI != ble.LOCK_DISABLED &&
+                (lastRSSI == nil || lastRSSI! <= ble.sleepRSSI)) {
+                print("sleep display due to RSSI threshold")
+                sleepDisplay()
+                displaySleep = true // Mark as sleeping to prevent lock
+                return // Skip lock logic
+            }
             if (!isScreenLocked() && ble.lockRSSI != ble.LOCK_DISABLED) {
                 pauseNowPlaying()
                 lockOrSaveScreen()
@@ -501,6 +519,12 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
         prefs.set(value, forKey: "unlockRSSI")
         ble.unlockRSSI = value
     }
+    
+    @objc func setSleepRSSI(_ menuItem: NSMenuItem) {
+        let value = menuItem.tag
+        prefs.set(value, forKey: "sleepRSSI")
+        ble.sleepRSSI = value
+    }
 
     @objc func setTimeout(_ menuItem: NSMenuItem) {
         let value = menuItem.tag
@@ -597,6 +621,12 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
         constructRSSIMenu(lockRSSIMenu, #selector(setLockRSSI))
         item = lockRSSIMenu.addItem(withTitle: t("disabled"), action: #selector(setLockRSSI), keyEquivalent: "")
         item.tag = ble.LOCK_DISABLED
+        
+        let sleepRSSIItem = mainMenu.addItem(withTitle: t("sleep_rssi"), action: nil, keyEquivalent: "")
+            sleepRSSIItem.submenu = sleepRSSIMenu
+            constructRSSIMenu(sleepRSSIMenu, #selector(setSleepRSSI))
+            item = sleepRSSIMenu.addItem(withTitle: t("disabled"), action: #selector(setSleepRSSI), keyEquivalent: "")
+            item.tag = ble.LOCK_DISABLED
 
         let lockDelayItem = mainMenu.addItem(withTitle: t("lock_delay"), action: nil, keyEquivalent: "")
         lockDelayItem.submenu = lockDelayMenu
@@ -692,6 +722,10 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
         if unlockRSSI != 0 {
             ble.unlockRSSI = unlockRSSI
         }
+        let sleepRSSI = prefs.integer(forKey: "sleepRSSI")
+            if sleepRSSI != 0 {
+                ble.sleepRSSI = sleepRSSI
+        }
         let timeout = prefs.integer(forKey: "timeout")
         if timeout != 0 {
             ble.signalTimeout = Double(timeout)
diff --git a/BLEUnlock/BLE.swift b/BLEUnlock/BLE.swift
index b37fc88..e2128c9 100644
--- a/BLEUnlock/BLE.swift
+++ b/BLEUnlock/BLE.swift
@@ -129,6 +129,7 @@ class BLE: NSObject, CBCentralManagerDelegate, CBPeripheralDelegate {
     var presence = false
     var lockRSSI = -80
     var unlockRSSI = -60
+    var sleepRSSI: Int = -95
     var proximityTimeout = 5.0
     var signalTimeout = 60.0
     var lastReadAt = 0.0
diff --git a/BLEUnlock/Base.lproj/Localizable.strings b/BLEUnlock/Base.lproj/Localizable.strings
index 4e75488..5e13f89 100644
--- a/BLEUnlock/Base.lproj/Localizable.strings
+++ b/BLEUnlock/Base.lproj/Localizable.strings
@@ -36,3 +36,4 @@
 "use_screensaver_to_lock" = "Use Screensaver to Lock";
 "wake_on_proximity" = "Wake on Proximity";
 "wake_without_unlocking" = "Wake without Unlocking";
+"sleep_rssi" = "Sleep RSSI";
diff --git a/BLEUnlock/da.lproj/Localizable.strings b/BLEUnlock/da.lproj/Localizable.strings
index ccc259e..005e073 100644
--- a/BLEUnlock/da.lproj/Localizable.strings
+++ b/BLEUnlock/da.lproj/Localizable.strings
@@ -36,3 +36,4 @@
 "use_screensaver_to_lock" = "Brug screensaver til at låse";
 "wake_on_proximity" = "Vågn op på nærhed";
 "wake_without_unlocking" = "Vågn op uden at låse op";
+"sleep_rssi" = "Sleep RSSI";
diff --git a/BLEUnlock/de.lproj/Localizable.strings b/BLEUnlock/de.lproj/Localizable.strings
index c9d978e..51383d4 100644
--- a/BLEUnlock/de.lproj/Localizable.strings
+++ b/BLEUnlock/de.lproj/Localizable.strings
@@ -36,3 +36,4 @@
 "use_screensaver_to_lock" = "Den Bildschirmschoner verwenden zum Sperren";
 "wake_on_proximity" = "Aufwachen bei Annäherung";
 "wake_without_unlocking" = "Aufwachen ohne Entsperren";
+"sleep_rssi" = "RSSI im Ruhezustand";
diff --git a/BLEUnlock/ja.lproj/Localizable.strings b/BLEUnlock/ja.lproj/Localizable.strings
index 39910a7..51d618e 100644
--- a/BLEUnlock/ja.lproj/Localizable.strings
+++ b/BLEUnlock/ja.lproj/Localizable.strings
@@ -36,3 +36,4 @@
 "use_screensaver_to_lock" = "スクリーンセーバーでロック";
 "wake_on_proximity" = "画面スリープから復帰";
 "wake_without_unlocking" = "アンロックせずに画面復帰";
+"sleep_rssi" = "スリープ信号強度";
diff --git a/BLEUnlock/nb.lproj/Localizable.strings b/BLEUnlock/nb.lproj/Localizable.strings
index 37bc754..ced14b0 100644
--- a/BLEUnlock/nb.lproj/Localizable.strings
+++ b/BLEUnlock/nb.lproj/Localizable.strings
@@ -36,3 +36,4 @@
 "use_screensaver_to_lock" = "Bruke skjermsparer til å låse";
 "wake_on_proximity" = "Vekk ved nærhet";
 "wake_without_unlocking" = "Våkne uten å låse opp";
+"sleep_rssi" = "Sove RSSI";
diff --git a/BLEUnlock/sv.lproj/Localizable.strings b/BLEUnlock/sv.lproj/Localizable.strings
index 4ca0820..6987821 100644
--- a/BLEUnlock/sv.lproj/Localizable.strings
+++ b/BLEUnlock/sv.lproj/Localizable.strings
@@ -36,3 +36,4 @@
 "use_screensaver_to_lock" = "Använd skärmsläckare för att låsa";
 "wake_on_proximity" = "Väck om i närheten";
 "wake_without_unlocking" = "Vakna utan att låsa upp";
+"sleep_rssi" = "Sömn RSSI";
diff --git a/BLEUnlock/tr.lproj/Localizable.strings b/BLEUnlock/tr.lproj/Localizable.strings
index 1376de2..d1eb0c4 100644
--- a/BLEUnlock/tr.lproj/Localizable.strings
+++ b/BLEUnlock/tr.lproj/Localizable.strings
@@ -36,3 +36,4 @@
 "use_screensaver_to_lock" = "Kilit ekranı için ekran kuruyucu kullan";
 "wake_on_proximity" = "Uyandırma yakınlığı";
 "wake_without_unlocking" = "Kilidi açmadan uyanın";
+"sleep_rssi" = "Uyku RSSI";
diff --git a/BLEUnlock/zh-Hans.lproj/Localizable.strings b/BLEUnlock/zh-Hans.lproj/Localizable.strings
index c8a0303..32a8fca 100644
--- a/BLEUnlock/zh-Hans.lproj/Localizable.strings
+++ b/BLEUnlock/zh-Hans.lproj/Localizable.strings
@@ -36,3 +36,4 @@
 "use_screensaver_to_lock" = "用屏保来锁定它";
 "wake_on_proximity" = "靠近唤醒";
 "wake_without_unlocking" = "唤醒时不需解锁";
+"sleep_rssi" = "睡眠信号强度";