why does my nest cam keep recording when nothing is moving? it's filling up my nest aware history with useless clips.

Diagnosis

The Google Nest Cam Indoor Wired utilizes a combination of PIR (Passive Infrared) sensors and pixel-based motion analysis. When the camera records "ghost" clips with no visible movement, it is usually because the sensor is picking up infrared heat signatures that the human eye ignores, or the software is detecting "pixel shift." This occurs most frequently when the camera is pointed toward a window, a heat vent, or a reflective surface like a mirror or glass table. Rapid changes in lighting—such as a cloud passing over the sun or a flickering LED bulb—cause the image contrast to shift instantly. The camera interprets this sudden change in pixel values as a moving object entering the frame, triggering a recording event. Additionally, if the camera is mounted near a curtain or a plant, subtle airflow from an HVAC vent can cause micro-movements that the high-sensitivity sensor flags as significant activity, filling your Nest Aware history with redundant footage.

How to Fix It

To eliminate false positives and refine your recording history, you must calibrate the motion sensitivity and isolate specific trigger areas. Follow these precise steps:

1. Open the Google Home app and select your Nest Cam Indoor Wired from the device list.
2. Tap the Settings (gear icon) in the top right corner of the screen.
3. Select Events and then navigate to Seen Events.
4. Adjust the sensitivity slider for "People" and "Other motion." If you only care about humans, toggle "Other motion" to Off entirely. This prevents the camera from recording pets, shadows, or blowing curtains.
5. Go back to the Settings menu and select Activity Zones.
6. Tap Add to create a new zone. Instead of covering the whole room, draw a tight polygon around high-traffic areas, such as a doorway or a hallway entrance.
7. Crucially, ensure no part of your zone overlaps with a window, a mirror, or a direct heat source (like a radiator).
8. Save the zone and test it by walking into the designated area to ensure the trigger is still active.

If That Didn't Work

• Relocate the Camera: If the camera is facing a window, the changing sunlight will continue to trigger "Other motion" regardless of settings. Rotate the camera 15-30 degrees away from the light source or move it to a corner where it has a clear view of the room without direct sunlight hitting the lens.
• Check for IR Interference: If you have other infrared devices in the room (like a remote control receiver or certain smart lights), they can create "noise" for the Nest Cam's sensor. Move the camera at least 3 feet away from other electronic emitters.
• Clean the Lens: Dust buildup or a smudge on the lens can cause the autofocus or light-sensing software to "pulse," which the camera interprets as motion. Use a clean, dry microfiber cloth to gently wipe the lens surface.
• Power Cycle the Device: Unplug the power cable from the back of the camera, wait exactly 30 seconds, and plug it back in. This clears the temporary cache and resets the motion calibration baseline.

Heads Up

• Avoid placing the camera directly opposite a mirror; the reflection of the camera's own infrared LEDs at night can cause a feedback loop that triggers constant recording.
• Be aware that "Other motion" includes pets. If you have a cat or dog, you must use Activity Zones to exclude the floor level if you want to stop animal-triggered clips.
• Keep the camera away from HVAC vents. A blast of hot or cold air directly onto the PIR sensor will trigger a "Heat Signature" event, causing the camera to record even in a completely empty room.