34 year old female, rigors, chills, skin sensitivity (even the warm air in the room feels cold on skin/slight itching feels like hard scratching), trouble sleeping, 5 months post partum, breastfeeding. Episodes of rigors, chills, skin sensitivity come and go but only occur at night. Only on those nights trouble sleeping is experienced. Otherwise, sleep is 8-10 hours per night with no trouble falling or staying asleep. Typically 1 night in duration but has previously been 2 nights in duration. Also accompanied by headache and muscle/joint pain. All symptoms gone by the following morning, except the headache. No fever. No other symptoms. Only prescription birth control. No other medications.