All-Night Mask

This mask is purchased from the Curiosity Shop for 500 Rupees.  It allows the user to not fall asleep.  It's creators are unknown, but it was apparently a torture device for insomnia.
It's only use is if Link wears the mask while listening to Anju's Grandmother's stories, he won't fall asleep, so he can answer her first question right.  If he does she will award him with a Piece of Heart.  Also, if Link answers "I dunno" to her second question, she will give him another Piece of Heart.

More later, BYYYYYYYYEEEEEEEEE!!!!!!!!!!!!!!!!!