Fever with body pain and cold that now comes at night is often due to a viral infection that is slowly settling but still causing symptoms. Take proper rest, drink warm fluids, do steam inhalation, eat light food, and stay well hydrated to support recovery. Keep your room comfortable, use a light covering, and maintain a regular sleep routine to improve sleep quality. If the fever continues or worsens, or if sleep is severely affected, consult a doctor to determine the cause and guide appropriate treatment.