1. Really? The hair and nails continue growing after death.
After death, the body will lose moisture that means the surface will dry. Shrink and wrinkles of the skin will look like longer or extended hair and nails region, but it was only a mirage. Really, hair and nails don’t grow. Hair and nails grow when the body innervated by hormones, but after death, the body doesn’t have hormones. Research on the law of the growth of hair cells confirm that the hair will continue growing when we live only.
Reference. http://europasia.net/?p=8
2. The myth "Nails continue growing after death"
Belief that the death’s hair and nails continue grow. It is false because the skin is shrink. After the death make lower hormones which growth of hair and nails.
Ref. http://www.noyshop.com/web-board/board.php?newsId=173