 When my alarm clock went off, I instinctively reached for my phone on the nightstand next to me. Don't worry, I stopped myself. But it turns out I'm not alone in keeping my phone right next to me throughout the night. We find with young adults, phones are usually within an arm reach. That's Elizabeth Dowdell. She's a nursing professor at Villanova University, just outside of Philadelphia, where she researches digital behavior in teens and young adults. Her area of expertise? Sleep texting.