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A high resolution GPS or other locator system is embedded in house slippers (or shoes for the blind in the city). As one walks about small vibrators alert when nearing obstacles. An optional forward mounted vibrator in each slipper helps guide to the bathroom or refrigerator. Aid to the sleepwalker!
||I'll take a pair for tonight...several beers, and I'll know I'll be getting up in the night, and unwilling to turn on the light.........