Ring of Sustenance, Improved (3.5e Equipment)
From D&D Wiki
This ring functions as a normal 'Ring of Sustenance,' continually providing its wearer with life-sustaining nourishment. Instead of not needing to eat or drink and requiring only 2 hours of sleep to gain the benefit of 8 hours of sleep, the wearer need not eat, drink, sleep or breathe. Like a 'Ring of Sustenance,' the ring must be worn for a full week before it begins to work. If it is removed, the owner must wear it for another week to reattune it to himself.