Glasses that shine a light in your eyes &mdash sounds like the world&rsquos worst gag gift, right But it may be just what the doctor ordered for frequent flyers. Designed to reprogram your circadian rhythms, these nifty &mdash albeit bulky &mdash sleep glasses needn&rsquot even be carried on. Use them beforehand to program yourself for your destination on arrival. ($299, www.re-timer.com)