Take an A student used to scoring in the top 10 percent of virtually anything she does. Via Brain Rules: 12 Principles for Surviving and Thriving at Work, Home, and School: The most pleasurable way is to just make sure you’re getting enough sleep. Actual competence may weaken self-confidence, as competent individuals may falsely assume that others have an equivalent understanding. The Dunning–Kruger effect is a cognitive bias in which unskilled people make poor decisions and reach erroneous conclusions, but their incompetence denies them the metacognitive ability to recognize their mistakes. The unskilled therefore suffer from illusory superiority, rating their ability as above average, much higher than it actually is, while the highly skilled underrate their own abilities, suffering from illusory inferiority.

It has since been dubbed the Dunning–Kruger effect: Source: “Why People Fail to Recognize Their Own Incompetence” from Current Directions in Psychological Science Because these notions often do not correlate with objective performance, they can lead people to make judgments about their performance that have little to do with actual accomplishment. People base their perceptions of performance, in part, on their preconceived notions about their skills. This lack of awareness arises because poor performers are doubly cursed: Their lack of skill deprives them not only of the ability to produce correct responses, but also of the expertise necessary to surmise that they are not producing them. However, people tend to be blissfully unaware of their incompetence. Successful negotiation of everyday life would seem to require people to possess insight about deficiencies in their intellectual and social skills. To oversimplify it a tad - stupid people may be too stupid to realize they’re stupid:

If you don’t have the experience (or the mental firepower) to do this effectively, your judgements won’t be accurate. To know how skilled you are at something, you need to watch yourself, watch others and compare.

Stupid brain book