chills got worse/rigors; headache; uncomfortable nights sleeps; This is a spontaneous report received from contactable reporter(s) (Nurse). The reporter is the patient.  A 56-year-old female patient (not pregnant) received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 15Jan2023 at 11:30 as dose 5 (booster), single (Lot number: GJ6796) at the age of 56 years, in left arm for covid-19 immunisation. The patient's relevant medical history included: "Myopia" (unspecified if ongoing); "some hearing loss" (unspecified if ongoing); "I started to experience chills" (unspecified if ongoing). Concomitant medication(s) included: CENTRUM WOMEN 50+. Past drug history included: Contrast iodine, reaction(s): "known allergies: Contrast Iodine"; Morphine, reaction(s): "known allergies: Morphine", notes: known allergies: Morphine. Vaccination history included: BNT162b2 (prev dose product: COVID 19, Prev dose brand: Pfizer, Prev dose brand unknown: False, Is bivalent: False, Prev dose lot number: FJ4991, Prev dose lot unknown: False, Prev dose administration date: 14Jun2022, Prev dose dose number: 4, Prev dose vaccine location: Left arm), administration date: 14Jun2022, when the patient was 56-year-old, for COVID-19 Immunization; BNT162b2 (prev dose product: COVID 19, Prev dose brand: Pfizer, Prev dose brand unknown: False, Is bivalent: False, Prev dose lot number: FJ8762, Prev dose lot unknown: False, Prev dose administration date: 06Dec2021, Prev dose dose number: 3, Prev dose vaccine location: Left arm), administration date: 06Dec2021, when the patient was 55-year-old, for COVID-19 Immunization; BNT162b2 (prev dose product: COVID 19, Prev dose brand: Pfizer, Prev dose brand unknown: False, Is bivalent: False, Prev dose lot number: EW0176, Prev dose lot unknown: False, Prev dose administration date: 04May2021, Prev dose dose number: 2, Prev dose vaccine location: Left arm), administration date: 04May2021, when the patient was 55-year-old, for COVID-19 Immunization; BNT162b2 (prev dose product: COVID 19, Prev dose brand: Pfizer, Prev dose brand unknown: False, Is bivalent: False, Prev dose lot number: EW0162, Prev dose lot unknown: False, Prev dose administration date: 13Apr2021, Prev dose dose number: 1, Prev dose vaccine location: Left arm), administration date: 13Apr2021, when the patient was 55-year-old, for COVID-19 Immunization.  The following information was reported: CHILLS (non-serious) with onset 15Jan2023 at 19:00, outcome "recovered" (Jan2023), described as "chills got worse/rigors"; HEADACHE (non-serious) with onset 15Jan2023 at 19:00, outcome "recovered" (Jan2023); SLEEP DISORDER (non-serious) with onset 15Jan2023 at 19:00, outcome "recovered" (Jan2023), described as "uncomfortable nights sleeps". Therapeutic measures were not taken as a result of chills, headache, sleep disorder.  Additional information: At 7pm on Jan 15th after receiving the Covid 19 bivalent Vaccine I started to experience Chills. I went to bed and the chills got worse Than I started to have rigors and a Headache. I could not get warm waves of Chills kept coming over me. I had a very Uncomfortable nights sleeps with successive Waves of chills rigorsRapu2022.If covid prior vaccination: No. If covid tested post vaccination: No. The patient did not take any vaccine in four weeks.