In my experience it does not PREVENT sleep but merely reduces the time you are suffering from the status ailment.
Sleep is a black/red/drk spell.
Auction House: Scrolls - White Magic Scroll of Barsleepra
[Inventory] All RacesWHM Lv.7 Teaches the white magic Barsleepra. Enhances resistance against sleep for party members within area of effect. Submit a Picture | Submit a correction Sold by Merchants for about 244 gil: |