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I landed in the United States three days ago and still haven’t gotten over the jet lag. The pills I take every night aren’t doing much good – I keep waking up at 3 A.M. and then can’t get back to sleep again. I feel terribly nauseous, and am concerned that the sleeping pills my wife gave me before I left home are somehow managing to change the taste of the water, turning it heavy and bitter, as though it’s...