Day and night

Peter and I have been noticing quite frequently in movies and TV shows the totally unnatural switches between daylight hours and night in scenes. Such as the incident which causes the car chase happens in broad daylight, but when they cut to the chase scene it is suddenly the dead of night. I was just watching an episode of Cops LAC and a similar thing happened, the homeless guy and the cop get shot in broad daylight, but they then cut to the scene with the paramedics are in attendance and it is suddenly pitch black with torches and spotlights. This also happens with the weather too in these types of scenes - the start of the drama starts in fine sunny weather, but suddenly turns into rainy weather when there wasn't even a cloud in the sky a minute ago.