diff --git a/homeassistant/components/yeelight/binary_sensor.py b/homeassistant/components/yeelight/binary_sensor.py
index cc2145d93b4..1696ca9bcb2 100644
--- a/homeassistant/components/yeelight/binary_sensor.py
+++ b/homeassistant/components/yeelight/binary_sensor.py
@@ -47,6 +47,13 @@ class YeelightNightlightModeSensor(BinarySensorEntity):
         if unique:
             return unique + "-nightlight_sensor"
 
+        return None
+
+    @property
+    def available(self) -> bool:
+        """Return if bulb is available."""
+        return self._device.available
+
     @property
     def should_poll(self):
         """No polling needed."""
diff --git a/homeassistant/components/yeelight/light.py b/homeassistant/components/yeelight/light.py
index e0ece2afdb9..244ccd5745d 100644
--- a/homeassistant/components/yeelight/light.py
+++ b/homeassistant/components/yeelight/light.py
@@ -917,6 +917,8 @@ class YeelightNightLightMode(YeelightGenericLight):
         if unique:
             return unique + "-nightlight"
 
+        return None
+
     @property
     def name(self) -> str:
         """Return the name of the device if any."""