If you expend a lot of energy outdoors, you will soak your clothing. You will likely get hypothermia from moisture and die. However, if you can create any shelter insulated with snow overhead and with a moisture barrier below, then the internal temperature will remain above freezing. Then, if you can change into dry clothing and get into a below-zero rated down sleeping bag, such as the Marmot Never Summer 0-degree bag, then you can last for hours. However, you will be warmer if you can boil water, pour it into liter bottles, then place the liter bottles inside the sleeping bag with you. Also, food energy will help your body generate heat. So, you will need many essential items in order to survive overnight. You do not need to travel to Alaska or Antarctica to experience the threat of freezing to death. You can pass into hypothermia anywhere the temperature drops below forty degrees. You lose twenty times more heat when wet than if you are dry.