What blue light is actually doing to you
Your photoreceptors can't tell the differenceThe cells in your eyes that detect blue light are the same ones that signal your brain to suppress melatonin. They cannot distinguish a phone screen from the sun. Every minute of screen time after dark is indistinguishable from standing outside at noon.
Melatonin gets delayed by up to 90 minutesJust two hours of screen exposure after dark suppresses melatonin production for up to 90 minutes past when you put your phone down. You feel wired at midnight and destroyed at 6am, not because you're broken, because your biology is working exactly as designed against artificial light.
Your deep sleep takes the worst hitEven when you do fall asleep, delayed melatonin pushes back your first deep sleep cycle. Less deep sleep means less growth hormone, less tissue repair, less REM, and a sleep score that refuses to move no matter how many hours you log.
The morning after is neurochemicalLow melatonin the night before means elevated cortisol the next morning, before your alarm even goes off. You wake up already in a stress state. That dread, that brain fog, that inability to get started, that's what disrupted melatonin looks like 8 hours later.
