Melinda Beck:

Out of every 100 people who believe they only need five or six hours of sleep a night, only about five people really do, Dr. Buysse says. The rest end up chronically sleep deprived, part of the one-third of U.S. adults who get less than the recommended seven hours of sleep per night, according to a report last month by the Centers for Disease Control and Prevention.

I am no short sleeper and am very much a morning person. Yet, I see the same thing that the WSJ is reporting here — many people thinking they do need less sleep than what they truly need. Funny thing is this last bit in the article:

Nowadays, some short sleepers gravitate to fields like blogging, videogame design and social media, where their sleep habits come in handy.

Some people, in an already tiny group, gravitate towards these professions — just found that irrelevant and funny to include.