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The body starts to slow as the temperature drops. Aside from the cold that is felt and the shivering that may occur, mental function is most affected initially. A particular danger of hypothermia is that it develops gradually, and since it affects thinking and reasoning, it may go unnoticed. Initial hunger and nausea will give way to apathy as the core body temperature drops. This is followed by confusion, lethargy, slurred speech, loss of consciousness, and coma. Often the affected person will lie down, fall asleep, and die. In some cases, the patient will paradoxically remove their clothes just before this occurs.

Source: medicinenet.com