I had my first Pfizer shot on Tuesday of this week.
The only side effects I had were a sore arm, which started at 10 pm that night and lasted about 18 hours, and I also slept for 11 hours straight on Tuesday night. I never do that, so I think it was "vaccination fatigue" which is listed as a possible side effect.
Opposite for me after my second Moderna shot on Tuesday. I woke up around 3 AM Wednesday morning, couldn't get back to sleep. I only slept maybe 3 hours. I felt fatigued on Wednesday and generally a little crappy, but I'm not sure how much of that was due to the vaccine vs. lack of sleep. I think it was a combination because I felt more fatigued than usual after nights of insufficient sleep. My temperature was normal. It's not that unusual for me to wake up way too early or have trouble getting to sleep, so I can't blame the vaccine for that. The only thing I experienced with the first dose is some mild pain in my arm near the injections site. The second dose is said to cause greater side effects.
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