A special circle of hell is reserved for hotels that fail to rouse their guests with a promised wake-up call. Technophobic travelers rely on the traditional front desk ping; programming the ubiquitous hotel room alarm clock is a weighty task many find more complicated than filling out taxes or setting a VCR, according to a 2005 survey. Hotels are noticing that missed wake-up calls are their Achilles Heel, and some are taking corrective action.