After my second vaccine, I have significant episodes of tachycardia.; It bothered me so much at night, I would get out of bed.; After my second vaccine, I have significant episodes of tachycardia./Irregular heartbeat very noticeable at bedtime; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 70 year-old female patient (not pregnant) received bnt162b2 (BNT162B2), administered in arm left, administration date 01Mar2021 10:30 (Lot number: EN6201) at the age of 70 years as dose 2, single for covid-19 immunisation. Relevant medical history included: "Asthma (mild)" (unspecified if ongoing), notes: Verbatim: Asthma (Mild); "Known allergies: Wallnuts" (unspecified if ongoing); "atrial tachycardia" (ongoing). Concomitant medication(s) included: FLOVENT HFA taken for asthma; VITAMIN C [ASCORBIC ACID]. Vaccination history included: Bnt162b2 (Dose Number: 1, Batch/Lot No: WL9261, Location of injection: Arm Left, Vaccine Administration Time: 11:15 AM), administration date: 31Jan2021, when the patient was 70 years old, for Covid-19 Immunization. The following information was reported: TACHYCARDIA (non-serious) with onset 01Mar2021 03:00, outcome "recovered" (2021), described as "After my second vaccine, I have significant episodes of tachycardia./Irregular heartbeat very noticeable at bedtime"; CONDITION AGGRAVATED (non-serious) with onset 01Mar2021 17:00, outcome "unknown", described as "After my second vaccine, I have significant episodes of tachycardia."; SLEEP DISORDER (non-serious) with onset 01Mar2021 17:00, outcome "unknown", described as "It bothered me so much at night, I would get out of bed.". The events "after my second vaccine, i have significant episodes of tachycardia./irregular heartbeat very noticeable at bedtime", "after my second vaccine, i have significant episodes of tachycardia." and "it bothered me so much at night, i would get out of bed." were evaluated at the physician office visit. Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of tachycardia. Therapeutic measures were not taken as a result of condition aggravated, sleep disorder.  Additional information: The patient stated he had atrial tachycardia and periodically had tachycardia. After her second vaccine, she had significant episodes of tachycardia. It bothered her so much at night, she would get out of bed. She was concerned enough that she made an appointment with her cardiologist. Her ekg was normal. He mentioned he had not heard of problems with the vaccine and tachycardia. Irregular Heartbeat very noticeable at bedtime. The adverse event resulted in Doctor or other healthcare professional office/clinic visit. The patient did not receive any other vaccines within 4 weeks prior to the COVID vaccine. Prior to vaccination, the patient was not diagnosed with COVID-19. Since the vaccination, the patient had been tested for COVID-19. The patient stated Pfizer vaccine was administered on 01Mar at 10:30 AM. She was not certain of the time for the onset of frequent tachycardia during the day. It persisted throughout the day and disrupted her sleep. 04Mar2021 she visited her cardiologist. An in office EKG was normal. He prescribed medication to take as needed but she didn't take often. She can't remember when symptoms eased but noticed more tachycardia since Vaccine.  Follow-up attempts are completed. No further information is expected.