Mine are happening far more frequently. Because I have numerous other autoimmune health issues, they can pile up. I have been missing so much work lately because of them. There is no schedule and you're right. One minute you feel like, wow, I can go to dinner tomorrow. I worked all day and still functioned when I got home, maybe the worst is over! Next morning....Boom! Can't get out of bed. The hardest part of all is when people see you out one day, then the following Monday you are gone from work, they don't realize how many other functions or family events you've missed. They think you pick and choose or judge you. We go to the dunes every couple months. I've heard through some that people wonder how I can ride quads "all weekend" and have health issues at work. Well, what they don't know is that my husband packed everything up and maybe that particular weekend, all I did was sleep, sit by the campfire, watch my friends head out on their quad, and read.....