>>1426879•1: Make sure the sleeping bag is rated for 10+ degrees lower than the lowest temp your region normally sees during that time of the year.
•2: use a closed cell sleeping pad under you that has an R-value of at least 3 for 3-season and an R-value of 5 for winter.
•3: Do not wear your normal daytime clothing while sleeping. Instead wear PJs if you must wear something. Your body creates humidity and if you get too hot you'll sweat. This moisture can cause all manner of cold problems for you. It gets worse if those are the clothes you normally wear out and about and they are wet.
•4: If you wear socks to sleep, make sure they are LOOSE socks that do not constrict to your feet at all. That way they will not reduce blood circulation. Your feet will be far warmer with loose socks. tight socks can cause frost bite in bad weather, fyi.
•5: Control your temperature. You should not be overheating and sweating at all when the weather is cold. If you are, it can cause problems, as stated above. You can better control your comfort using layers and zippers. Open the sleeping bag, stick an arm/leg out to help cool off if you need to or just. If you are wearing socks, you can remove them to cool off. The same goes with your PJs. Knitted headgear can go a longways to keeping you warm when sleeping and can be taken off when you are too warm. You can also use a thin piece of material to drape over your upper head so only your nose and mouth stick out for breathing (never breath into your sleeping bag as the added moisture will make things worse).
