Playable Sims can fill the bar by fulfilling wants, but fulfilling fears decreases the aspiration bar. In addition, a selectable Sim's daily aspiration bar will decrease gradually over time, unless he or she is sleeping, meditating, or at work or school. Also, the aspiration bar does not decrease while the Sim is in class. In general, the higher a Sim's aspiration level is, the more quickly it will decay. Learning the Lifelong Happiness life skill will reduce the rate at which the aspiration bar decays. The aspiration bar has a finite capacity, which increases as the Sim ages.