(It took me at LEAST 10 days for my brain to get back to what passes for normal after gen. anasthesia. Still doesn’t feel as though all cylinders are firing correctly.)
Bejeweled may be a silly game, but after my stroke, it helped me greatly in getting my concentration back. Anesthetic doesn't have as much of an effect, but yeah, you can spend a few days feeling like there's a cloud behind your eyes.