Keep in mind that most of these techniques assume dry weather. If it's raining or snowing, the steps are the same, but you'll have to do them inside your tent or vestibule. It is also assumed that you have a sleeping bag rated for around the same temperatures you're likely to be experiencing, but the techniques demonstrated here can give you some wiggle-room with that. Remember: being prepared is always step one.
As always, anyone see something I'm doing wrong, could be doing better, or should be doing that I'm not, let me know!
Also, with the exception of the two intro pics, they're all staged on a closed course by professionals, but rest assured that these techniques do work. Hopefully, they'll help you get a better night's sleep, and in doing so help you better enjoy the great outdoors.
Step 1: Put on Your Fly.
The fly also provides a vestibule, which is an extremely useful thing to have, especially in windy or rainy situations.
On the downside, it does block your view of the stars, but I can forgo marveling at the majesty of the cosmos if it means not freezing to death.