Any Sleeping monster will automatically wake up on its turn. Characters with at least 80 maximum HP also always wake up, while characters with less have a chance to wake up proportional to their maximum HP. Sleeping targets effectively have no Evade score when attacked. Sleep wears off at the end of combat. It can also be cured with the CUR4spell.
Any Sleeping creature has a chance to wake up on its turn based on its maximum hit points. Creatures with at least 80 maximum hp always wake up (though they lose their turn doing so). Other creatures have a chance to wake up proportional to their maximum hp. Sleeping targets effectively have no Evasion score when attacked. Sleep wears off at the end of combat. It can also be cured with the Cure4spell.
Sleep is a dangerous temporary status ailment, similar in many ways to Paralysis, though easier to shake off. Sleepingcharacters don't get to take actions, nor are they able to physically evade attacks. It is this second property of Sleep that makes it dangerous. Sleep can be cured with a simple Basunaspell of any level.
Psyche is the game's odd name for sleep. Creatures with Psyche cannot avoid attacks and their ATB gauge does not fill. Any physical attack will remove Psyche, and the status will automatically end after approximately 38 seconds.