Why You Wake Up at 3AM

You wake up at 1:29am, stare at the ceiling, and assume something is wrong with you. It isn't. For most of human history, people slept in two shifts: a first sleep, a quiet waking hour to pray, think, or tend the fire, then a second sleep. Someone awake in the dark meant protection for the whole group. The waking was never the problem. The anxiety about it is, and so are the glowing screens. Your brain is doing exactly what it was built to do.