There can be several possible explanations for the flashes of light and shadows you are seeing outside your window at night. Here are a few potential reasons:
Lightning: If the flashes of light coincide with stormy weather, it's possible that you are seeing lightning. Even if you can't hear thunder or see rain, distant lightning can still be visible. Lightning flashes can illuminate the sky and create brief bursts of light.
Artificial light sources: Flashes of light could be caused by artificial light sources in the vicinity. It could be from passing cars, streetlights, or other external light fixtures. Sometimes, these lights can be reflected off surfaces or objects, creating intermittent flashes.
Camera flashes: If there are people nearby taking photographs or using their camera's flash, the flashes of light could be originating from them. Camera flashes can be quite bright and visible from a distance, especially in dark environments.
Fireworks: Depending on the time of year or specific events happening nearby, fireworks could be the source of the flashes you are observing. Fireworks often produce bright, colorful bursts of light in the sky, and the flashes can be visible even if you can't hear the accompanying sounds.
Regarding the shadows you mentioned, they could be caused by various factors, including passing objects, trees or branches swaying in the wind, or even movement within your room. Shadows can be cast by both natural and artificial light sources, and they can appear and disappear quickly, depending on the changing light conditions.
If the flashes of light or shadows persist and cause concern, it may be helpful to investigate further. You could try looking out your window during the times when you notice these phenomena to determine their source. If the issue continues or if you have any safety concerns, it's advisable to reach out to local authorities or consult with professionals who can assess the situation in person.