If you're always cold (or always hot), adjust accordingly.
Sleeping Bag : When selecting your bag, temperature rating is a good place to start. If you're planning on only going fair-weather camping, a summer bag is probably all you'll need. But a 3-season bag will give you more leeway for unpredictable shoulder-season weather. If you're always cold (or always hot), adjust accordingly. And no need to go with a super-snug mummy bag like backpackers use. A rectangular camping bag will give your body more room to roam. To learn more, read How to Choose a Camping Bag.