diff --git a/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt b/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt
index a9eb0a3..5f95080 100644
--- a/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt
+++ b/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt
@@ -1823,6 +1823,36 @@ fun PiezoMonitoringView(appState: AppState) {
                                 colors = SwitchDefaults.colors(checkedTrackColor = Color(0xFFD32F2F))
                             )
                         }
+
+                        // Wakeup 알람 발동을 위한 LYING 유지 시간 (dev 조절 가능)
+                        var lyingDurVal by remember {
+                            mutableStateOf(
+                                com.example.medilightv2android.services.WakeupAlarmPrefs.lyingDurationSec(context).toFloat()
+                            )
+                        }
+                        Row(verticalAlignment = Alignment.CenterVertically) {
+                            Text("Lying Duration", fontSize = labelSize, fontWeight = FontWeight.SemiBold)
+                            Spacer(modifier = Modifier.width(8.dp))
+                            Text(
+                                if (lyingDurVal < 60) "${lyingDurVal.toInt()}초"
+                                else "${(lyingDurVal / 60).toInt()}분 ${(lyingDurVal.toInt() % 60)}초",
+                                fontSize = 13.sp, fontWeight = FontWeight.Bold, color = MlPrimary
+                            )
+                            Spacer(modifier = Modifier.weight(1f))
+                            Text("이상 lying 후 일어나면 알람", fontSize = 10.sp, color = MlSecondaryText)
+                        }
+                        Slider(
+                            value = lyingDurVal,
+                            onValueChange = {
+                                lyingDurVal = it
+                                val sec = it.toInt()
+                                com.example.medilightv2android.services.WakeupAlarmPrefs.setLyingDurationSec(context, sec)
+                                wakeupDetector.lyingDurationSec = sec
+                            },
+                            valueRange = 5f..600f,    // 5초 ~ 10분
+                            steps = 0,
+                            colors = SliderDefaults.colors(thumbColor = MlPrimary, activeTrackColor = MlPrimary)
+                        )
                     }
 
                     HorizontalDivider(modifier = Modifier.padding(vertical = dividerPadding))