Did you take any sleeping clothes or just kip in your riding gear? Do you have bivvy bags as well as the tarp? Which rocks are the softest to use as a pillow?
I had standard alpkit sleeping mat, standard sleeping bag, and decathlon tarp..
No Bivvy bag for me as the tarp provided cover from dew / demons...
Just slept in my riding gear, with a buff on the head! If i'd have been muddy, I had a spare base layer i'd have slept in. It was really comfortable, but I rarely feel the cold TBH.
Once I'm in a sleeping bag, I generate so much heat (stop sniggering class...) that I end up opening the bag at about 3am!