Orfeu Buxton, PhD, neuroscientist and assistant professor in the division of sleep medicine at Harvard Medical School and a Pop Center faculty member, is quoted in this New York Times article on how having a smartphone in the bedroom may negatively impact sleep.
http://mobile.nytimes.com/blogs/bits/2014/02/09/for-a-restful-night-make-your-smartphone-sleep-on-the-couch/