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Bucky Foam Sleep Mask
Good Houskeeping recently rated this sleeping mask #1 for its contoured shape (which let testers blink comfortably) and its adjustable velcro strap.
Sleep masks are great for travel. Just throw one into your carry-on, slip it over your head, and close your eyes until you arrive at your destination rested and refreshed. Regardless of where you go, sleep masks block all kinds of light -- street lights, sunlight, car lights.
I've been a light sleeper all my life. I have tried many sleep masks over the years and I can tell you that these masks are the very best I've tried. You can also create your very own "world of darkness" when one person wants to read while the other one sleeps.