YOUR CITY IS STEALING THE NIGHT FROM YOU. Walking outside after dark or not blocking your windows in almost any modern city blasts enough artificial light into your eyes to disrupt your nightly melatonin spike. Melatonin repairs mitochondria, resets every cell clock in your body and counteracts the damage of the day. Look at the chart. Sunlight can blast you with 120,000 lux so you stay alert and awake. After sunset the light lux collapses. A full moon reflects usually less than 0.3 lux onto Earth. That dim glow lets your melatonin flow free. But your melatonin starts shutting down major flow at under 10 lux of light. Streetlights and city skyglow blow past that number every night. City citizens have not seen a real dark night in years. Their circadian rhythm gets smashed on a loop over and over again. Everyone obsesses over food and workouts. What healthy smoothies they got today. Their orange theory group class. None of them mention or care about the nighlty glow outside their window that does more bad health damage than a junk meal or a missed workout session. Bring back the dark. Use sleep masks, blue blockers and black out curtains if you must. See the link in my bio for my top picks.