Woops. Turns out I've been on a performance enhancing drug these past years. Budesonide -- a steroid. Not that I've really noticed the performance enhancing effect. I was taking the drug for Crohns, which it did help control. But now I'm in the process of phasing it out. The doctor said to take 2/3 my former dose for 4 weeks, then 1/3 for another 4, then stop -- but to extend the 4 weeks as needed if my body was slow to adjust. "How will I notice that?" I asked. "You'll feel tired," he replied. At that point I'd been on the 2/3 dose for 2 weeks and hadn't noticed anything. But today, 5 days later -- wham! I suddenly feel leaden. So I guess it was pepping me up after all. Be warned Trek420. I may be really slow on a bike again when we go for a ride next week. I'm hoping I'll have adjusted to the lower dosage by then, though.