It's interesting insight into how much sleep people actually get, but the article mixes up actual statistics with some random data pulled from elsewhere. What's

It's interesting insight into how much sleep people actually get, but the article mixes up actual statistics with some random data pulled from elsewhere. What's missing is, for example, the data on how the amount of deep sleep impacts the individual's short-term memory, activity and "feeling refreshed" (sic). We don't actually know where those stats come from, so this conclusion is a bit far-fetched: "these findings further support the general recommendation that most adults need to consistently sleep 7 to 9 hours per night".