I have a Nvidia gforce 7300

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Why when come the hour of evening around 18:00 when start to dark in the game for night my house have a over screen something like that an turn to a red transparent color,, why this happen?

Ok, I dont have right now a picture but i will make it and post it later or tomorrow... but the hill cover only the first level that its like a bassement, but the problem is in the second and third floor that them are not covered by nothing

I building a hose that half of it is on a little mountain my question is why in some part of the house is to dark?? i put window but still the shadow is to hard.. its this normal?