diff --git a/homeassistant/components/vesync/humidifier.py b/homeassistant/components/vesync/humidifier.py
index 40ea015f4d8483..5afe73606735d5 100644
--- a/homeassistant/components/vesync/humidifier.py
+++ b/homeassistant/components/vesync/humidifier.py
@@ -157,11 +157,15 @@ def set_mode(self, mode: str) -> None:
         """Set the mode of the device."""
         if mode not in self.available_modes:
             raise HomeAssistantError(
-                "{mode} is not one of the valid available modes: {self.available_modes}"
+                f"{mode} is not one of the valid available modes: {self.available_modes}"
             )
         if not self.device.set_humidity_mode(self._get_vs_mode(mode)):
             raise HomeAssistantError(f"An error occurred while setting mode {mode}.")
 
+        if mode == MODE_SLEEP:
+            # We successfully changed the mode. Consider it a success even if display operation fails.
+            self.device.set_display(False)
+
         # Changing mode while humidifier is off actually turns it on, as per the app. But
         # the library does not seem to update the device_status. It is also possible that
         # other attributes get updated. Scheduling a forced refresh to get device status.
diff --git a/tests/components/vesync/test_humidifier.py b/tests/components/vesync/test_humidifier.py
index b93c97baab635e..d5057c449513eb 100644
--- a/tests/components/vesync/test_humidifier.py
+++ b/tests/components/vesync/test_humidifier.py
@@ -10,9 +10,16 @@
     ATTR_HUMIDITY,
     ATTR_MODE,
     DOMAIN as HUMIDIFIER_DOMAIN,
+    MODE_AUTO,
+    MODE_SLEEP,
     SERVICE_SET_HUMIDITY,
     SERVICE_SET_MODE,
 )
+from homeassistant.components.vesync.const import (
+    VS_HUMIDIFIER_MODE_AUTO,
+    VS_HUMIDIFIER_MODE_MANUAL,
+    VS_HUMIDIFIER_MODE_SLEEP,
+)
 from homeassistant.config_entries import ConfigEntry, ConfigEntryState
 from homeassistant.const import (
     ATTR_ENTITY_ID,
@@ -222,7 +229,7 @@ async def test_set_mode(
         await hass.services.async_call(
             HUMIDIFIER_DOMAIN,
             SERVICE_SET_MODE,
-            {ATTR_ENTITY_ID: ENTITY_HUMIDIFIER, ATTR_MODE: "auto"},
+            {ATTR_ENTITY_ID: ENTITY_HUMIDIFIER, ATTR_MODE: MODE_AUTO},
             blocking=True,
         )
     await hass.async_block_till_done()
@@ -285,3 +292,38 @@ async def test_valid_mist_modes(
         await hass.async_block_till_done()
         assert "Unknown mode 'auto'" not in caplog.text
         assert "Unknown mode 'manual'" not in caplog.text
+
+
+async def test_set_mode_sleep_turns_display_off(
+    hass: HomeAssistant,
+    config_entry: ConfigEntry,
+    humidifier,
+    manager,
+) -> None:
+    """Test update of display for sleep mode."""
+
+    # First define valid mist modes
+    humidifier.mist_modes = [
+        VS_HUMIDIFIER_MODE_AUTO,
+        VS_HUMIDIFIER_MODE_MANUAL,
+        VS_HUMIDIFIER_MODE_SLEEP,
+    ]
+
+    with patch(
+        "homeassistant.components.vesync.async_generate_device_list",
+        return_value=[humidifier],
+    ):
+        await hass.config_entries.async_setup(config_entry.entry_id)
+        await hass.async_block_till_done()
+
+    with (
+        patch.object(humidifier, "set_humidity_mode", return_value=True),
+        patch.object(humidifier, "set_display") as display_mock,
+    ):
+        await hass.services.async_call(
+            HUMIDIFIER_DOMAIN,
+            SERVICE_SET_MODE,
+            {ATTR_ENTITY_ID: ENTITY_HUMIDIFIER, ATTR_MODE: MODE_SLEEP},
+            blocking=True,
+        )
+        display_mock.assert_called_once_with(False)