Many, many great tips but this ^^^^ is the best, I don't do the mountaineering, mummy, sleep under the stars anymore but even if you sleep in a bed in a cabin ^^^^ this is the best tip... I've been doing it for 50 years.it makes your morning clothes nice and toasty warm when you put them on instead of being a cold shock
I sleep in a square drop home built trailer on a full size mattress, with 2 massive winter rectangular cotton bags plus a 3 season synthetic bag, and I just pick the number of layer I need. But wet is never an issue and American Express and the Hilton are never far away.
But yes, every one of those tips are invaluable.