Sleeping on the Ground in the Rain

I spent the night at Bear Heaven and it rained.
...and rained...
...and rained some more...
A lot of rain.

Not just a lot of rain for a little bit. An-unrelenting-lot from the time it started.

I put on the poncho and wandered around, looking for the other 2 geocaches at this little campground. I found the first one (Bear Haven - as it's named on a couple of different maps, but I prefer Bear Heaven as the Mon Forest Map and road signs call it - Bear Heaven sounds like Nirvana and Bear Haven sounds like someplace the Bears have to go to save themselves. What a difference an 'e' can make.), but the other (On the Rocks) will have to wait for another day (when it's not raining).
I set up camp in the rain.
It continued to rain.
It rained some more.
It rained all night.
It rained in the morning.
I took camp down in the rain.
It continued to rain.
I threw the wet tent and tarp in the car.
It continued to rain.
I loaded up and headed home.
It rained the whole way.
And it kept right on raining.....

Sleeping on the Ground

I went camping and the main thing I'm still pondering over is sleeping.
In a tent.
On the ground.

When did sleeping on the ground become something I'd think about?
More to the point: When did it become noticeably uncomfortable?
And can it be reversed? Is it just because I, as I am inclined to (want to) believe, am not used to it?
It never bothered me 20 years ago and I don't want to believe that it's the 20 years, by themselves, that matter.
It's not like I haven't camped in 20 years, but I guess bedroll-with-a-few-extra-blankets-because-we're-car-camping is not sleeping-bag-on-ground-camping.

I will suck it up and get over it.

Noteably: It has been 20 years since I've camped alone.
I like the solitude and the quiet. I like it so much I will be doing more of it. I'm setting up my backpack for my next trip so I can hike in and ditch the car-camping.