Not exactly an item but I do remember several campaigns that on our second straight day with no sleep the DM was struggling to stay awake. He started rolling the nerf dice (so they didnt make too much noise) and any creature we came upon. He would roll the damage and he would state very slowly "Ahhhh you kill em". This was not really noticed because we were tired too until we came upon a horde of 100 giant rats(the dice were not friendly to us on that random roll) and on the first attack the wizard cast fireball and without figuring the damage the DM said "Ahhhhh ya kill em" and then fell asleep in his chair.

Good times- drinking jolt, eating steakums and fried baloney, and sitting in uncomfortable chairs in my friends kitchen.