Part of the PT was ultrasonic massage. Which involved siting the 'electrodes', placing a warm, moist towel over them, and then putting a gel-pad on top of that. The gel-pad was fairly dense, and meant that there was noticeable weight on my back. The whole process was quite pleasant, and I seem to be in good shape now.
But that gel-pad got me thinking: When I'm lying in bed - asleep or not - I'll opt for keeping the temperature lower than normal and adding additional layers of blanket, in preference to keeping the temperature at a comfortable level and using only a light blanket or a topsheet. A brief bit of chat on #C suggests that other people opt for the extra layers - and their weight - as well.
I'm curious, and would appreciate your thoughts: Why? Is this some sort of hindbrain response, buried so deep in our history that there's no real hope of figuring out why, or can people put a reason to why they like the extra weight? Or is it as overwhelmingly popular as I think it is, at all? If you don't feel this way, I'd like to hear that, as well, and why not. And feel free to spread the question around; it's a public entry.