Prepare certain you have at minimum two of everything you plan to wear (including shoes or boots, etc. Evenings and those hours spent asleep and in bed are likely to be the areas that most want addressing to ensure you stay warm. The sleeping bag has been constructed with a lot of care and foresight.
The style of sleeping bag will also dictate its insulating properties. Sleeping bags are a key camping essential and when you're looking to buy one you need to understand the facts. The best time to buy is at the end of the season, when shops are clearing their the summer months stocks and may discount camping equipment by as much as 50%.