I did seven years in the Royal Engineers and still have my old down-filled sleeping bag, only it's got pretty smelly over the years and I don't think it can be dry-cleaned. When I did use it, I found it pretty comfortable. Let's see how good my son's sleeping bag is.
One rider praised those cot-type camping beds which keep you a few inches off the ground, but that would be a pretty tight fit in my 2-man Khyam Eiger.
I always sleep in the buff but I can see that wearing something would make things easier to move around.