For anyone curios, I had not significant reaction to neither first, nor second Pfizer shot, short of going to bed on both days around 11pm, while my usual time would be around 1am or 2am. I did have Covid last March, however, so probably still some antibodies present. I also never ever had any reaction to the multitude of vaccines from my childhood, all the way to the last 10-15 years of regular flu shots.