As vaccine side-effects go....

[davidgillon]

... feeling really sleepy isn't bad. I checked, and it's not listed as a common side-effect of the flu vaccine, but it is how my body often reacts to having a bug, so I'm saying that's the reason and planning not to do much of anything at all today. In fact today's primary goal is simply to keep my eyes open long enough I don't screw up my sleep-cycle any further.