The mattress has become one of those things. I've been waking up in the middle of the night thinking something is wrong. Then I realize that I'm really comfortable, and I don't have shooting pains in an arm, or numb hands, or a lot of issues related to an old and decrepit mattress. And realize I'm feeling really good. Then I go back to sleep. I think it's similar to being so used to noise that you can't fall asleep when it's quiet. I'd like to get used to this.
I've been sleeping a lot better at Civil War events, lately, too. This year, for the very first time, I've been sleeping on a cot, rather than just a backpacker pad. Okay, so I'm not the "hardened campaigner" I used to be, but I think that after 20+ years, I don't have to prove anything any more. I'm amazed at how comfortable even a cot about as wide as my shoulders can be.