Why do I get fever and chills at night?

Online Answer
If the temperature in your bedroom is too cold, or if you aren't covered by enough clothing or blankets, you may wake up shivering during the night. Other possible causes include: Infection: Fevers are the consequence of an immune system reaction to an infection, including bacterial and viral infections.
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Hypothermia is defined as a body core temperature below 35.0 °C (95.0 °F) in humans. Symptoms depend on the temperature. In mild hypothermia, there is shivering and mental confusion. In moderate hypothermia, shivering stops and confusion increases..