I had my annual flu vaccination one week ago. As usual, I had mild soreness at site of injection, at first, that was only side effect. As the week progressed, however, I began feeling more fatigued.About day 4, post injection, I was sleeping about 10 hours at night. It seemed I needed lots more sleep. Day 5-6, I was sleeping 15+ hours.
Now, at day 9, the fatigue has gone, and I am back to normal.
I am not a medical person. What I suspect happened, my immune system was chugging along, working overtime, to develop antibiodies to help ward off flu.
Additionally, I was drinking more fluids. I believe my immune system is sluggish from PMR, and it's work of developing antibodies taxed my energy, thus requiring more sleep.
I look forward to what others think about the increased need for sleep/fatigue.
PMR diagnosed 2013