I got my Moderna booster on Friday at about 1:00 PM. I had some mild soreness in my shoulder later in the evening, just like the first two shots, but in the middle of the night my shoulder was really sore, making it hard to sleep, and I also had a headache and body aches. I felt a bit lousy all day Saturday, but nothing too bad, and today I'm feeling OK. To be honest, I'm surprised how strong of a reaction I had to the booster, which is 1/2 of the standard dose?