What did strike me was that it seemed a good explaination for why I feel so good (psychologically) after a drunk, even if physically I feel like shit. One of my my favourite models for how my mind works is as a hugely complicated estuary, hundreds of tiny channels, little rills of thought, attitude and mind which can be protected, eroded, diverted, dammed, dug out or silted. The drunk is like a flood, sweeping away the silt and deposited crap, the weeds and rot and lobsters and stagnant pools, so afterwards I feel (counter-intuitively) refreshed and cleansed.
I suppose Sacks would point out that this year, I've been drinking less, and maybe the migraines have stepped in to fill the gap. I wonder if he'd have any practical advice. Maybe that was in the later chapters.