And now, more evidence that most adults are just overgrown toddlers. Much like cranky 2-year-olds, we grown-ups are a little better at tolerating minor frustrations after a nap, according to researchers from the University of Michigan, who published a study this week in the journal Personality and Individual Differences.

At a sleepy time of day — 1 p.m. — the study participants gathered in the lab, where they completed, among other things, a purposefully irritating test, designed to measure their stamina for tolerating frustration. They were presented with geometric designs on a computer screen, which they were told to draw on a sheet of paper, without tracing any line twice or lifting their pencil from their paper. For about half the designs they saw, this was an impossible task. But the researchers kept track of how long they tried.

Read the full article "Scientists Make a Case for the Angry Nap" at New York Magazine.