Some sleep problems are obvious: When you’re tossing and turning all night, or waking up every hour, it’s clear that something's wrong. But sometimes, sleep quality can be more ambiguous. And until now, there weren’t any real guidelines to define what, exactly, good sleep really is. That changed last month when the National Sleep Foundation published a first-of-its-kind set of sleep-quality recommendations in the journal Sleep Health. These guidelines, established by a panel of medical experts and based on a review of 277 previous studies, include several measures people can use to determine how well they’re really sleeping at night.
