Sleeping on the ground is horrible and the last time I did it, I couldn't move my left arm for a good few mins as I more or less cut off the blood circulation to it. If you want to be a man, awesome for you, i'd rather not wake up feeling like I've slept in next doors garden.
I normally do camping trips where I don't have to carry my stuff with me so I tend to take an inflatable air bed. I prefer the ones that are textile on the outside rather than the cheap plastic ones. I've got a big up-down cylinder pump to inflate it, saves messing around with battery pumps and it's more reliable.
If you dont have to carry your own stuff i would take a full size double mattress. "Here you go Mr Sherpa"
Thermarests are really expensive and as mentioned above, more about warmth than being comfortable. Even if you just sleep on one extra layer of sponge, you'll be warmer than sleeping on the ground.
Get a new sleeping bag tbh! I hate the cold and so hit Download festival in this Vango Nitestar sleeping bag - didn't need any kind of mat cos it was so nice and padded![]()