Here:

CPAP UPDATE: I have a little piece in this week's Time special on sleep about my apnea diagnosis and treatment. But there have been some subsequent developments. In general, I haven't had the amazing burst of energy I had after my night in the hospital. Maybe the psychosomatic explanation holds up. But my sleep has been better; and longer; and deeper. I'm told it takes time to feel the cumulative effects; I do feel more rested; and sleeping itself has been much easier than I anticipated. But one side-effect has surprised me. It probably shouldn't have. It makes sense, after all. I'll give you a subtle hint: when you have air being pumped into you with a face mask for eight hours a night, and when there's nowhere for it to escape, except some small holes in the top of the mask, then the air finds other outlets. So now, I officially have hot air coming out of both ends. The boyfriend has to choose between being deafened or fumigated. But my sleep is heavenly.

I read Isaac Asimov's autobiography some years ago, and the main thing that sticks in my mind was his obsessive discussion of his kidney stones.