diff --git a/custom_components/smartthinq_sensors/switch.py b/custom_components/smartthinq_sensors/switch.py
index 91e09353..8a91c1e5 100644
--- a/custom_components/smartthinq_sensors/switch.py
+++ b/custom_components/smartthinq_sensors/switch.py
@@ -225,6 +225,14 @@ def _async_discover_device(lge_devices: dict) -> None:
             ]
         )
 
+        # add AC sleep mode switch
+        lge_switch.extend(
+            [
+                LGESleepModeSwitch(lge_device)
+                for lge_device in lge_devices.get(DeviceType.AC, [])
+            ]
+        )
+
         # add MicroWave switch
         lge_switch.extend(
             [
@@ -345,3 +353,28 @@ async def async_turn_on(self, **kwargs):
         """Turn the entity on."""
         self._wrap_device.device.set_duct_zone(self._zone, True)
         self._api.async_set_updated()
+
+
+class LGESleepModeSwitch(LGESwitch):
+    """Class to control LGE AC reservation sleep time as switch"""
+
+    def __init__(self, api: LGEDevice):
+        desc = ThinQSwitchEntityDescription(
+            key=AirConditionerFeatures.RESERVATION_SLEEP_TIME,
+            name="Sleep mode",
+            icon="mdi:weather-night",
+            available_fn=lambda x: x.device.is_reservation_sleep_time_available,
+            turn_off_fn=lambda x: x.device.set_reservation_sleep_time(0),
+            turn_on_fn=lambda x: x.device.set_reservation_sleep_time(60 * 7),
+        )
+        super().__init__(api, desc)
+
+    @property
+    def is_on(self):
+        """Return the state of the switch."""
+        return self._get_switch_state() > 0
+
+    # No sure if this should be a sensor
+    # @property
+    # def extra_state_attributes(self):
+    #     return {"Remaining time (in minutes)": self._get_switch_state()}
diff --git a/custom_components/smartthinq_sensors/wideq/const.py b/custom_components/smartthinq_sensors/wideq/const.py
index 23c95bf6..5233659a 100644
--- a/custom_components/smartthinq_sensors/wideq/const.py
+++ b/custom_components/smartthinq_sensors/wideq/const.py
@@ -44,6 +44,7 @@ class AirConditionerFeatures(StrEnum):
     ROOM_TEMP = "room_temperature"
     WATER_IN_TEMP = "water_in_temperature"
     WATER_OUT_TEMP = "water_out_temperature"
+    RESERVATION_SLEEP_TIME = "reservation_sleep_time"
 
 
 class AirPurifierFeatures(StrEnum):
diff --git a/custom_components/smartthinq_sensors/wideq/devices/ac.py b/custom_components/smartthinq_sensors/wideq/devices/ac.py
index 3eab6138..4402cf5e 100644
--- a/custom_components/smartthinq_sensors/wideq/devices/ac.py
+++ b/custom_components/smartthinq_sensors/wideq/devices/ac.py
@@ -3,6 +3,7 @@
 
 from enum import Enum
 import logging
+from math import ceil
 
 from ..const import AirConditionerFeatures, TemperatureUnit
 from ..core_async import ClientAsync
@@ -61,6 +62,7 @@
 STATE_MODE_AIRCLEAN = ["AirClean", "airState.wMode.airClean"]
 STATE_MODE_JET = ["Jet", "airState.wMode.jet"]
 STATE_LIGHTING_DISPLAY = ["DisplayControl", "airState.lightingState.displayControl"]
+STATE_RESERVATION_SLEEP_TIME = ["SleepTime", "airState.reservation.sleepTime"]
 
 FILTER_TYPES = [
     [
@@ -87,6 +89,7 @@
 CMD_STATE_MODE_AIRCLEAN = [CTRL_BASIC, "Set", STATE_MODE_AIRCLEAN]
 CMD_STATE_MODE_JET = [CTRL_BASIC, "Set", STATE_MODE_JET]
 CMD_STATE_LIGHTING_DISPLAY = [CTRL_BASIC, "Set", STATE_LIGHTING_DISPLAY]
+CMD_RESERVATION_SLEEP_TIME = [CTRL_BASIC, "Set", STATE_RESERVATION_SLEEP_TIME]
 
 # AWHP Section
 STATE_WATER_IN_TEMP = ["WaterInTempCur", "airState.tempState.inWaterCurrent"]
@@ -866,6 +869,24 @@ async def get_filter_state_v2(self):
             self._filter_status_supported = False
             return None
 
+    async def set_reservation_sleep_time(self, value: float):
+        keys = self._get_cmd_keys(CMD_RESERVATION_SLEEP_TIME)
+        await self.set(
+            keys[0],  # "basicCtrl",
+            keys[1],  # "Set",
+            key=keys[2],  # key="airState.reservation.sleepTime",
+            value=str(ceil(value)),
+        )
+
+    @property
+    def is_reservation_sleep_time_available(self):
+        value = self._status.is_on and (
+            self._status.operation_mode
+            in [ACMode.ACO.name, ACMode.FAN.name, ACMode.COOL.name, ACMode.DRY.name]
+        )
+
+        return value
+
     async def set(
         self, ctrl_key, command, *, key=None, value=None, data=None, ctrl_path=None
     ):
@@ -1274,6 +1295,16 @@ def hot_water_target_max_temp(self):
         key = self._get_state_key(STATE_HOT_WATER_MAX_TEMP)
         return self._str_to_temp(self._data.get(key))
 
+    @property
+    def reservation_sleep_time(self):
+        """Return display lighting status."""
+        key = self._get_state_key(STATE_RESERVATION_SLEEP_TIME)
+        value = float(self._data.get(key))
+
+        return self._update_feature(
+            AirConditionerFeatures.RESERVATION_SLEEP_TIME, value, False
+        )
+
     def _update_features(self):
         _ = [
             self.current_temp,
@@ -1287,4 +1318,5 @@ def _update_features(self):
             self.water_out_current_temp,
             self.mode_awhp_silent,
             self.hot_water_current_temp,
+            self.reservation_sleep_time,
         ]