Over the past decade, there's been an emerging focus on the importance of sleep. Thousands of books and articles have been put out which drive home just how central sleep is in our mental and physical health. This emphasis on sleep has had the positive effect of motivating people to better prioritize it. But, there's been a downside to all this sleep talk as well: people are getting more stressed out if they're not getting the kind of sleep they think they're supposed to.