For most of us, the last thing we see before closing our eyes isn’t the face of a loved one or the peaceful dimming of a bedside lamp—it’s the harsh, artificial glow of a smartphone screen. We tell ourselves it’s harmless, a quick scroll to “wind down” or a necessary precaution in case of an emergency. But keeping your phone within arm’s reach at night is doing far more than just eating into your sleep schedule; it is fundamentally rewiring your nervous system and sabotaging your relationship with rest. The assault on your biology begins the moment that blue light…