"Avoid screens before bed" is one of the most common pieces of sleep advice. But what if the real problem isn't screen time—it's the way we use social media at night?

Research suggests that how often people check social media − and how emotionally engaged they are with it − can influence sleep even more than how much time they spend online.

Dr. John Cacioppo, the world’s leading social isolation researcher. His statement sounds loud in the ear when you take i ...