Most of the time I sleep with a window open -- even in the dead of winter. I love waking up to that biting chill and it makes sleep come so much easier. Yesterday however was freezing when I woke up. My window was open ALL the way and man.... a lot of cold air was let in. After scrambling out of bed and immediately closing the window, I headed downstairs to let Yama outside. Frost! I don't know if it was the first of the season (probably not) but it was the first big one that I have noticed. It really was beautiful.