diff --git a/internal/mouse/mouse.go b/internal/mouse/mouse.go
index c3da803..1b2fef5 100644
--- a/internal/mouse/mouse.go
+++ b/internal/mouse/mouse.go
@@ -40,7 +40,8 @@ func (c *Controller) MoveMouse() {
 		// Update last known mouse position
 		c.LastX, c.LastY = robotgo.Location()
 
-		time.Sleep(c.SleepInterval)
+		// Sleep before the next iteration
+		c.sleep()
 	}
 }
 
@@ -51,3 +52,16 @@ func (c *Controller) SetSleepInterval(interval time.Duration) {
 func (c *Controller) SetSleepIntervalSec(sec int) {
 	c.SetSleepInterval(time.Duration(sec) * time.Second)
 }
+
+func (c *Controller) sleep() {
+	var duration time.Duration
+
+	if c.SleepInterval > 0 {
+		duration = c.SleepInterval
+	} else {
+		// Get random duration between 10-60 sec
+		duration = time.Duration(rand.N(51)+10) * time.Second
+	}
+
+	time.Sleep(duration)
+}
diff --git a/internal/tray/tray.go b/internal/tray/tray.go
index 9bd0cca..fe70062 100644
--- a/internal/tray/tray.go
+++ b/internal/tray/tray.go
@@ -72,17 +72,18 @@ func (t *Tray) onReady() {
 		mDisable.Hide()
 	}
 
-	// Default sleep interval
-	t.mouseController.SetSleepIntervalSec(10)
-
 	// Add interval selection submenu items
+	t.addIntervalItem(mInterval, "10-60 sec", -1)
 	t.addIntervalItem(mInterval, "10 sec", 10)
 	t.addIntervalItem(mInterval, "20 sec", 20)
 	t.addIntervalItem(mInterval, "30 sec", 30)
 	t.addIntervalItem(mInterval, "60 sec", 60)
 
+	// Set the default sleep interval
+	t.mouseController.SetSleepIntervalSec(-1)
+
 	// Mark the default interval
-	t.intervalItems[10].Check()
+	t.intervalItems[-1].Check()
 
 	// Create a channel to listen for interval item clicks
 	intervalClicks := t.createIntervalClicksChannel()