When you're low on sleep, it all looks good: I get a bit cranky when I'm not getting a sufficient amount of sleep, but I have seen people who get a bit giddy instead. This latter reaction is apparently the norm. After a bout of sleep deprivation, a trip to the MRI shows that subjects tend to have an overactive reward system, making them more prone to judge emotional stimuli as pleasant compared to control subjects. The risk here is that anyone trying to make a decision after pulling an all-nighter will be prone to assuming everything will work out well.
"Based on this evidence, I'd be concerned by an emergency room doctor who's been up for 20 hours straight making rational decisions about my health," said the paper's author. I also wouldn't necessarily trust the sleep-deprived to take an important exam.
NFL updates are violently upsetting: This is a pretty weird study: gather all the reports of domestic violence around the time of a football game and correlate them not only with the final outcome but with the Vegas odds on the game. The goal was to see whether unexpected losses—losses where the oddsmakers expected a win—were more likely to be associated with post-game violence. Compared to a win or an expected loss, they were. According to the authors, things were even worse when the home team was still in playoff contention or was playing one of its traditional rivals.
Some of these effects were pretty subtle, and some of the comparisons were done against days without games, so I wouldn't necessarily expect them to hold up in larger studies. Still, the upset vs. expected loss comparison seems pretty solid.
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