Because Stephenie Meyer is a shitty लेखक who can't write to save her life. And she uses words that, make readers confused. She is using बिना सोचे समझे works like "beautiful, and sparkle, and such" to make the reader fall even और in प्यार with the vampires, such as "Edward Cullen."
In myth, वैंपायर are supposed to burn when sunlight reaches their skin. And also, they can be killed with wooden stake and they fear holy objects like the Holy Cross, garlic फूल etc. Stephanie Meyer moulded her version of वैंपायर so that they can go about easily instead of just coming out at night and also to make them seem indestructable. Meyer wanted to make her वैंपायर absolutely flawless, so she brought it up that her version of वैंपायर sparkle.
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Bram Stoker completely ignored that myth when he wrote Dracula. What's wrong with that guy?
Because its Smeyer's sexual कल्पना and sparkling is apparently 'hot'. And it's based on a dream. It does not do to dwell on dreams, Harry. DUMBLEDORE HAS SPOKEN!!! Sorry, just felt like लेखन that.