I wake multiple times in the night; don't feel rested the next day; Since receiving the 3rd dose of Pfizer I have had insomnia/I cannot fall asleep without aid.; Since receiving the 3rd dose of Pfizer; This is a spontaneous report received from contactable reporter (Consumer). The reporter is the patient.  A 53-year-old female patient (not pregnant) received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE), administered in arm left, administration date 07Oct2021 11:30 (Lot number: FF8841) at the age of 53 years as dose 3 (booster), single for covid-19 immunisation. The patient had no relevant medical history. Concomitant medication(s) included: FLUCELVAX QUADRIVALENT, administration date 28Sep2021. Vaccination history included: Bnt162b2 (Dose Number: 1, Single, Batch/Lot No: EN6202, Location of injection: Arm Left, Vaccine Administration Time: 12:00 PM), administration date: 27Feb2021, when the patient was 52 years old, for COVID-19 immunization, reaction(s): "No adverse reaction"; Bnt162b2 (Dose Number: 2, Single, Batch/Lot No: EP7534, Location of injection: Arm Left, Vaccine Administration Time: 12:00 PM), administration date: 20Mar2021, when the patient was 52 years old, for COVID-19 immunization, reaction(s): "Arm pain", "headache", "Inability to sleep". The following information was reported: IMMUNISATION (non-serious) with onset 07Oct2021, outcome "unknown", described as "Since receiving the 3rd dose of Pfizer"; INSOMNIA (non-serious) with onset 07Oct2021 22:00, outcome "not recovered", described as "Since receiving the 3rd dose of Pfizer I have had insomnia/I cannot fall asleep without aid."; MIDDLE INSOMNIA (non-serious), outcome "not recovered", described as "I wake multiple times in the night"; RESTLESSNESS (non-serious), outcome "not recovered", described as "don't feel rested the next day". The events "since receiving the 3rd dose of pfizer i have had insomnia/i cannot fall asleep without aid.", "i wake multiple times in the night" and "don't feel rested the next day" were evaluated at the physician office visit. Therapeutic measures were taken as a result of insomnia, middle insomnia, restlessness. Additional Information: The patient has unspecified drug allergy. Since receiving the 3rd dose of Pfizer the patient have had insomnia. She cannot fall asleep without aid. The aids she have tried included Tylenol PM (which helped one night - even though she still woke up twice, but did not help her sleep the next night - she was awake all night) and various mg of Melatonin, 5mg and 10 mg Melatonin helped me fall asleep eventually, but she woke multiple times in the night and didn't feel rested the next day. In her 53 years of life, she have never had difficulty falling asleep. Before her booster shot, she routinely got 8 hours of sleep every night with no issue. She had no side-effects after the 1st Pfizer dose, but after the 2nd dose she experienced arm pain, headache and the inability to sleep the first night. All symptoms were gone after 36 hours. The patient was not diagnosed with COVID-19 prior to vaccination and has not been tested for COVID-19 since the vaccination.  No follow-up attempts are possible. No further information is expected.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202101401507 same reporter/product, different dose/AE