Rise and shine—and check your smartphone? That would have sounded foreign to most people 10 years ago, but it's now the natural course of action after shutting off your alarm.

Moreover, it's not just adults who can't start their day without first checking their phone. It's teenagers, too.

Of the 95% of teens in the United States who have Internet access, 78% have smartphones. Those smartphones are jam-packed with apps, including for Facebook, Snapchat, Instagram, and Spotify. Even texting, the most basic use for a smartphone, is being replaced by messaging apps, such as WhatsApp and Kik Messenger.

These days, for teenagers, using their smartphones in any and all situations is deemed acceptable. Whether they are sitting in class or hanging out at home in front of the TV, teens are constantly running apps.