On the fourth night, just as I was facing the dismal prospect of finishing my only book and thereafter having nothing to do in the evenings but lie in the half light and listen to Katz snore, I was delighted, thrilled, sublimely gratified to find that some earlier user had left a Graham Greene paperback. If there's one thing the AT teaches, it is low level ecstasy, something we can all do with more of in our lives