I live in a flat at the top floor of my building. There's a window in the roof right over my bed. Since I don't like waking up at the same time as the sun (especially during the summer), I use a t-shirt to cover it. The t-shirt has now spent approximately 6 months under the sun. The pictures below show what both sides look like now. I think I'll put sunscreen on next time I'm going on holiday...
