Success, on the whole, is associated with hard work, and those who succeed in becoming leaders will have to work harder than others in order to produce better results. Nevertheless, recent studies in psychology suggest that effort is not the only determinant of performance. Effort may not determine the level of performance achieved; what counts is the amount of energy left for decision-making.Depriving oneself of sleep, interrupting oneself constantly, using technology, stressing oneself out, and failing to recover are just a few ways in which energy is depleted from the very pool of energy required for good decisions and control.Success depends on more than effortThe first reason it is essential to manage one's energy is that it affects cognitive abilities without a recovery period. For example, according to recent experimental research on the impact of sleep deprivation on decision-making, complete absence of sleep was observed to be associated with changes in the quality of such decisions.However, at least a short recovery sleep mitigated the effect, suggesting that while humans might live without enough sleep, the quality of their decisions deteriorates much faster than expected.Similarly, the analysis conducted by the team of researchers working on the 2025 scoping review of scientific studies on the impact of sleep deprivation on decision-making, published on PubMed, revealed several aspects of this experience. First, insufficient sleep leads to impaired risk assessment, reasoning ability, patience, cognitive flexibility, and effort evaluation.The importance of the issue under consideration is that in addition to making people tired, sleep deprivation makes individuals less flexible. While success can be attributed to many decisions rather than just a few, the issue becomes clear: hard work alone is not enough for success. Effort is worthless if there is no strategic thinking behind it.Effort is not the only determinant of performance | Image Credit: PexelsThe biggest drains are often the least visibleThe difference between work and recovery has become clearer in psychology. In the 2026 study on psychological detachment among hospital nurses, it was found that the ability to detach one's mind from work during non-work periods was associated with lower levels of burnout. The psychologists believed that recovery was more than just leaving the workplace; the mind should not process any work-related demands, which may explain why some individuals become exhausted even when they are supposed to be resting.A study conducted in 2026 and analyzed in PubMed on fear of missing out, affective rumination, and digital connectivity found that continuous connectedness hindered individuals' ability to detach their minds from work. Smartphones can remind users about incomplete tasks by continuously keeping them in mind until they are finished.The act of paying attention itself seems to be one of the most valuable resources available to humans. Research presented in a 2024 meta-analysis in the Journal of Psychology shows very close connections among attentional control, working memory, fluid intelligence, and task-unrelated thoughts. While attention is fragmented, its consequences do not stop there; they affect other cognitive systems involved in processes such as learning, planning, and self-regulation.Another study of domain-specific cognitive flexibility conducted in 2025 concludes that changes needed for switching tasks will not necessarily carry over from one situation to another. In practice, it means that frequent task-switching might actually entail additional control costs and not greater efficiency. This understanding explains why the practice of guarding periods of uninterrupted attention is more than an issue of corporate performance culture.Great performers are usually viewed as people of exceptional self-discipline | Image Credit: PexelsRecovery is part of performance, not separate from itThe link between stress and decision-making even strengthens this theory. Acute stress affects cognition, emotions, motivation, and behavior during the decision-making process. In the case of continuous stress, individuals tend to make quick decisions based on simplistic reasoning, becoming inflexible regarding evaluations; consequently, saving energy also involves preserving decision-making quality.Another source of information that supports the thesis under discussion is a systematic review on work-related factors and cognitive functioning. According to the review's findings, stressful work environments may affect cognition when recovery opportunities are lacking. However, this statement does not imply that work is inherently negative; it merely highlights the interaction between work and recovery rather than their isolation.Cognitive effort may be intrinsically energy-efficient, meaning that mental activity is inherently based on transitions between energy-demanding states. While the theoretical framework is quite complex, its practical implications are quite clear: cognitive capacities are limited, and any drain upon them, including minor ones, repeated distractions, and chronic stress, is accumulated.Great performers are usually viewed as people of exceptional self-discipline, but psychology reveals a slightly different picture. In fact, they just know how to create the right environment for self-discipline to manifest. They ensure proper rest, focus, and a conducive work environment, and do not reach the point of exhaustion. These skills might not be particularly impressive to observe, but their effectiveness cannot be questioned in the long run.