Maybe all that sleep I've been getting isn't a good thing

Some nights I get 10-12 hours (I used to get 5-6).

Sleeping too little — or too much — bad for middle-age mind

People who moved to the long end of the sleep spectrum — sleeping more than eight hours a night — fared the worst, according to the authors.

"Almost all the experimental work that's being done in sleep laboratories is all about sleep deprivation," Ferrie said.

"But when we look at disease outcomes, when we look at mortality and now, cognitive function, which is the first time anyone's done this, it's the long end of the sleep distribution that seems to be the most harmful."

It's not clear why. One theory is that people who report long hours of sleep have fragmented sleep, Ferrie says. "They're actually in bed and sort of asleep for quite a long time, but they don't have the benefit of the deep sleep, which is the bit that's really restorative."

People suffering from depression also tend to sleep more, and depression itself has been associated with worse cognitive function.

Via Lin (@lwu5 on Twitter).

Speaking of sleep, it's 1:15 and I'm ready for bed. Good night.