I set infront of a large window at work 8 hours a day, the sun comes in a lot its winter time so its never hot but the sun is bright enough for me to squint some times. If im sitting facing this direct light for 8 hours can the sun coming through the window cause sunburn? I havent been applying any sunscreen as its winter and i don't go out side when the sun is out normally. Tonight i noticed my lips felt a bit tight and my face was a bit more flush and red.