Seasonal Flu Vaccine

Yesterday at school they gave students at school who accepted to take the seasonal flu vaccine the vaccine. I thought it was funny because my friend was so tired after she took it and she was so sleep but i was so sleepy to even though i didn't take the vaccine. Apparently when you take the vaccine you will get sick for a few days but after that you if you get ill again your doctor can tell if you have the swine flu but that's what i know from what hear. Any way did you take the vaccine and what did you feel after you took it?