Jar of What?

I wish it would quit being appreciably colder at nights than in the day. I don't insist that the season should hurry or slow down, I just wish the temperature range wasn't so jarring to me when the night comes every day as it has been lately. When I was younger, of course, this didn't matter. I doubt that I even used to know when there was a difference. Nowadays, though, if the day has been perfectly pleasant and easy to take, maybe even warm, WHY does the goddamn night temperature have to jar my eyeballs out of my head?!