I ride in a fashion similar to the OP. I'm generally somewhat tired after my rides and could easily take a nap but don't always do so. The need for a 2-3 hour nap would be unusual and depend on my sleep schedule on the day before my ride. I do suspect that if I was riding in the heat and humidity of Florida, I might too suffer in a similar fashion! I would also add (IMHO) that statins can and do (in many individuals) lead to muscular "issues". I've personally experienced a significant weakness that developed shortly after being put on Zocor many years ago! I discussed the issue with my physician, stopped the medication and the weakness resolved. While I'm not suggesting that anyone should stop taking prescribed medications without first discussing it with their primary care provider, I am suggesting that the OP (as a physician) take a serious look at ALL of the side effects of the statin class of cholesterol management medications. Just sayin' 😎.