All-Night Mask

The All-Night Mask allows the wearer to never fall asleep. In fact, it is impossible to fall asleep while you are wearing it.

Majora's Mask
While you will need an entire three day cycle to obtain the mask, it has only one use in the game. If you wear the mask while listening to the stories of Anju's Grandmother then you will not fall asleep. At the end of each story, Anju's Grandmother will ask you a simple question and if you give the appropriate answer then you will receive a Piece of Heart.

Obtaining The Mask
Sakon must be stopped from stealing the Big Bomb Bags on the first night. If this is done, then he can't sell them to the Curiosity Shop, and the shop will then sell the All-Night Mask instead. It can be purchased for 500 Rupees.

The Wind Waker
The All-Night Mask appears alongside several other masks behind the counter of the Nintendo Gallery. It can be seen hanging on the wall behind Carlov.