What can cause chills when lying down?

Chills when lying down can be caused by various factors, including a drop in body temperature due to a cold environment or inadequate bedding. They may also result from infections, such as the flu or other illnesses, where the body responds with chills as it fights off pathogens. Additionally, anxiety or stress can trigger a physiological response that includes chills. If chills persist or are accompanied by other concerning symptoms, it's advisable to consult a healthcare professional.