| CNN.com delivers up-to-the-minute news and information on the latest top stories, weather, entertainment, politics and more. | Want to know more about your dreams? | | A dizzying number of trackers are available for health and lifestyle. Enthusiasts can now chart every calorie burned or consumed, have their genetics broken down and backdated for centuries, or follow their stress levels through a family holiday. But while our waking moments become ever more transparent, the one-third of our life spent asleep has remained off limits. |
|
