warm afternoons, chilly mornings
In the old days, apparently, people opened their windows at night even when the weather was cold, and then shut them when they got up ("old days" in this case meaning the middle of the 20th century). We learn this from Eloise, and also from The Saturdays. In this era of energy efficiency it doesn't seem like quite the thing, but aside from that the practice does have an appeal. We did it last night, and it was delightful!
It was beautifully warm yesterday during the day, and as soon as it gets at all summery our upstairs starts to feel a little stuffy. So we opened the windows in the afternoon, and when we were ready for bed it still didn't feel cold, so they stayed open. It didn't feel at all cold overnight, either, but that's because we have good covers, because when I got up I couldn't help but notice that it was barely above 50°F downstairs (for the record, it was a bit warmer upstairs). So I shut the windows and turned on the heat. I expect that the windows will be open again before too long. I guess we're just old fashioned that way!