Cots
One of my biggest personal struggles in camping is sleeping. There are a lot of options from air mattresses, sleep pads, or cots. I have tried a cot and liked it to a degree, but it wasn't practical for me. I am a bigger person and the width of the cot was 28 inches wide, similar to a twin sized bed. I found myself waking up from my arms falling over the edge and dangling in the cold air. My wife tried the cot and felt like she would roll off it in the middle of the night because she turns a lot in her sleep.
They do come in wider varieties, but they typically aren't real wide. They also aren't very soft. Unless you pay a lot for one that has padding on it they are just taut canvas and have very little give.
They also can leave you quite cold if the cold bothers you a lot. Since they are open to the air below they don't have any kind of insulation to warm you from beneath. It is probably better than laying on the frozen ground, but I found air mattresses insulate better. I also found laying on a sleeping bag dealt with this just fine, but it is another layer you need with a cot. They are also heavy, bulky, and just take up a lot of room. They aren't real ideal for people without a ton of cargo space.
I obviously didn't think the cot a logical choice. There are some good things about them. It isn't on the floor so if you have trouble getting up and down that is a huge bonus. You can store gear under them, so your tent area is greater than just a sleeping bag on the ground. They keep you off the dirty floor so you could even use them without the tent and sleep under the stars without rolling around in the dirt. Being off the ground is great in the summer as you aren't trapping heat. It is probably very ideal for any type of long term base camping. If you are going to be coming back and living there for a longer period of time it may make sense.