>>950707cont'd
Another thing that I found pretty helpful especially for my toes (which were by far the coldest part of my body) was to take rocks from around my fire pit, let them cool off and put them under my sleeping bag but on top of my sleeping pad.
Go to sleep with a full stomach. Normally people say not to eat before going to sleep, but having some calories burning away will increase body heat quite a bit, I just had a can of beans right before shutting my eyes.
You probably won't have to take the same measures I did if it's only -10 c but thats pretty much everything I can think of that made big differences in terms of keeping warm. Any other questions I'd love to answer them for ya. It was my first winter trip longer than an over nighter and winter is now my favorite time to go camping.