Many iGen’ers and Millennials told me they almost always keep their phone on at night and are awakened by alerts and dings all night long. Many others told me they put their phones on silent but still end up grabbing it when they can’t sleep, even in the middle of the night. This is not a formula for healthy sleep. It’s not just the stimulation of the phone, but the light it emits: our caveman-evolved brains interpret it as sunlight, reducing our production of the sleep hormone
