The amount and frequency of these simple check-in messages indicates the intimacy level ofthe senders and receivers, with face-to-face repercussions if the ritual is not completed (Taylor & Harper,2003). Because of the silent mode of cell phones, the users' parents are generally unaware of this activity,which, in some cases, may last until 3 a.m. As early as 1999, the American Academy of Pediatricssuggested that children's bedrooms should be electronic-media free rooms, which most people think of astelevision or computers. More recently, pediatricians are finding that even moderate texting after lights outcan interrupt teenagers' sleep patterns. In Van den Bulck's study (2007), 62% of adolescents used theirmobiles after lights out and the higher intensity of use predicted higher levels of tiredness, even afterabstaining from late-night texting for a year