Passage Summary: Most people think they are getting less shut-eye than everyone else. Since we can't all be below average, a lot of us are clearly wrong about how much we sleep compared to our neighbors.

Conclusion: A significant portion of the population holds an incorrect belief regarding how their sleep habits compare to those of others.

Reasoning: A study shows most people believe they sleep less than most others, but it is mathematically impossible for a majority to be below the median.

Analysis: This is a mathematical trap. If 'most' (more than 50%) of people claim to be in a group that can only represent 'less than most' (less than 50%), then the math simply doesn't add up. The logical completion must point out that many people are mistaken about their relative sleep standing. It’s a polite way of saying that as a species, we are surprisingly bad at estimating where we fall on a bell curve.