Using E-Readers Before Bedtime May Disrupt Sleep Patterns.

Well” blog reports that after randomizing “12 healthy young adults to one of two activities: reading a light-emitting e-book in a dimly lit room for about four hours before bedtime on five consecutive evenings, or reading a printed book for the same amount of time,” researchers found that “compared with a printed book, a light-emitting e-book decreased sleepiness, reduced REM sleep (often called dream sleep), and substantially suppressed the normal bedtime rise of melatonin, the hormone that regulates the sleep and wake cycle.” People who read e-books reported feeling groggier and less alert in the morning. http://well.blogs.nytimes.com/2014/12/22/e-books-may-interfere-with-sleep/?_r=0