I had my 2nd Moderna shot a week and a half ago. First shot only gave me a very slight headache the second day. The 2nd Moderna shot made me sleepy after receiving it, and the next day, I was completely down with chills, weak, extreme body aches. My arm also was sore and I had about a 2" x 2" red mark which took a few days to go away. I slept something like 23 hours of 36 hours. Woke up the day after my bad day and felt great. Didn't seem to affect my EM, guess I was lucky.