8 hours after injection, I began to feel fatigued; So I went to sleep, slept through the night (Thursday), awakened and went back to sleep almost immediately, slept all day (Friday); I alternated between a fever, chills, and/or sweats; I alternated between a fever, chills, and/or sweats; I alternated between a fever, chills, and/or sweats; I lost my appetite; Felt general fatigue on Saturday; Did not feel completely better until Monday; Injection site (upper left arm) hurt all through the weekend; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 66 year-old male patient received bnt162b2 (BNT162B2), administered in arm left, administration date 21Oct2021 12:30 (Lot number: FF2590) at the age of 66 years as dose 3 (booster) , single for covid-19 immunisation. Relevant medical history included: "sleep apnea" (unspecified if ongoing); "Known allergies: penicillin" (unspecified if ongoing); "Afib" (unspecified if ongoing), notes: Afib (for seven years;disappeared after ablation); "Spongiotic dermatitis" (unspecified if ongoing). Concomitant medication(s) included: ATORVASTATIN; TADALAFIL; DUTASTERIDE; TUMS ANTACID. Past drug history included: Spectazole, reaction(s): "Known allergies:Spectazole"; Percocet, reaction(s): "Known allergies: Percocet". Vaccination history included: Bnt162b2 (prev dose product=COVID 19, prev dose brand=Pfizer, prev dose brand unknown=False, prev dose lot number=KN6208, prev dose lot unknown=False, prev dose administration date=16Apr2021, prev dose administration time=10:30AM, prev dose dose number=2, prev dose vaccine location=Left arm), administration date: 16Apr2021, when the patient was 66 years old, for Covid-19 immunization; Bnt162b2 (prev dose product=COVID 19, prev dose brand=Pfizer, prev dose brand unknown=False, prev dose lot number=ER8730, prev dose lot unknown=False, prev dose administration date=26Mar2021, prev dose administration time=01:30PM, prev dose dose number=1, prev dose vaccine location=Left arm), administration date: 26Mar2021, when the patient was 66 years old, for Covid-19 immunization; Flu (other vaccine 4weeks details other vaccine 4weeks product=Flu, other vaccine 4weeks vaccine date=30Sep2021, other vaccine 4weeks vaccine location=left arm), administration date: 30Sep2021, when the patient was 66 years old; Tdap vaccine, reaction(s): "Knwon allergies: TDAP vaccine". The following information was reported: FATIGUE (non-serious) with onset 21Oct2021 20:00, outcome "recovered" (2021), described as "8 hours after injection, I began to feel fatigued"; SOMNOLENCE (non-serious) with onset 21Oct2021 20:00, outcome "recovered" (2021), described as "So I went to sleep, slept through the night (Thursday), awakened and went back to sleep almost immediately, slept all day (Friday)"; PYREXIA (non-serious), CHILLS (non-serious), NIGHT SWEATS (non-serious) all with onset 21Oct2021 20:00, outcome "recovered" (2021) and all described as "I alternated between a fever, chills, and/or sweats"; DECREASED APPETITE (non-serious) with onset 21Oct2021 20:00, outcome "recovered" (2021), described as "I lost my appetite"; FATIGUE (non-serious) with onset 21Oct2021 20:00, outcome "recovered" (2021), described as "Felt general fatigue on Saturday"; MALAISE (non-serious) with onset 21Oct2021 20:00, outcome "recovered" (2021), described as "Did not feel completely better until Monday"; VACCINATION SITE PAIN (non-serious) with onset 21Oct2021 20:00, outcome "recovered" (2021), described as "Injection site (upper left arm) hurt all through the weekend". Therapeutic measures were not taken as a result of fatigue, somnolence, pyrexia, chills, night sweats, decreased appetite, fatigue, malaise, vaccination site pain.  Additional information: Facility type vaccine Pharmacy or Drug Store. If other vaccine in four weeks Yes. other medications in two weeks tadalafil, atorvastatin, Dutasteride, antacid. If covid prior vaccination No. If covid tested post vaccination No. Adverse event 8 hours after injection, I began to feel fatigued. So I went to sleep, slept through the night (Thursday),awakened and went back to sleep almost immediately, slept all day (Friday), overnight (Friday night), and awakened Saturday morning. During those 30 hours of sleep, I alternated between a fever, chills, and/or sweats. On Friday, I lost my appetite and had to force myself to eat. Felt general fatigue on Saturday, but was able to drive 5 hrs to (withheld). Did not feel completely better until Monday morning. Injection site (upper left arm) hurt all through the weekend, but no different or worse from the first two doses of the vaccine.  Follow-up attempts are completed. No further information is expected.