I would fell asleep for three hours and wake up and not able to go back to sleep again; I would get in to bed every evening and not able to sleep at all, not even for one minute; I have the energy so I am thinking the vaccine somehow affected my adrenal glands I guess; insomnia; This is a spontaneous report received from a contactable consumer or other non hcp. A 66-year-old male patient received bnt162b2 (BNT162B2, Formulation: Solution for injection, Batch/Lot Number: EN6198), dose 2 via an unspecified route of administration, administered in Arm Left on 03 Mar 2021 (at the age 66-year-old) as SINGLE DOSE for COVID-19 immunization. The patient's medical history and concomitant medications were not reported. The patient previously took BNT162B2 vaccine on 10Feb2021, experienced sore arm for couple of days and few days a little bit tired on an unspecified date. The patient experienced insomnia on 21 Mar 2021, "i would fell asleep for three hours and wake up and not able to go back to sleep again; i would get in to bed every evening and not able to sleep at all, not even for one minute on an unspecified date, i have the  energy so i am thinking the vaccine somehow affected my adrenal glands i guess". Consumer stated, "I am calling about Pfizer-BioNTech COVID-19 Vaccine. I was told and I have been waiting for close to an hour and this was the the number given to report the vaccine symptoms. I have some symptoms. I was fine, I had really no symptoms after the first vaccine just there was sore arm for couple of days and for a few days a little bit tired more than I normally would be. I got the second vaccine and then around the beginning of the third week like on Sunday 21Mar2021, I started which would be beginning of the third week after the vaccine, I don't know which I have never had before, I started getting every single day insomnia. I would fell asleep for three hours and wake up and not able to go back to sleep again and then that happened for two days. Then every two days, I would get in to bed every evening and not able to sleep at all, not even for one minute and then for another one or two days maximum of two to four hours of sleep when I usually get eight to nine. So, for next couple days not one minute of sleep and since last night, I didn't sleep for 1 minute and I still haven't slept at all." When paraphrased the concern, consumer stated, "I have got insomnia but I have the energy so I am thinking the vaccine somehow affected my adrenal glands I guess. I have no issues, I take medicines for nothing, no adrenal gland issues, nothing at all. I am in perfect health. I don't take any medicines for anything. I just have coffee whenever and didn't sleep well and and never have I had insomnia. Also, I am grateful for having both first and second shots of the vaccine. I hope that it ends, this insomnia."  Consumer further stated, "I want to report the symptom and also I would like to know how many people have reported the insomnia and what would be the reason. I haven't slept, so I would like to know some of the factors affecting my adrenal glands or whatever something is wrong." Outcome of the events was unknown. No follow-up attempts are possible; information about lot/batch number cannot be obtained.