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Screen light gets blamed for everything, and the truth is more interesting: evening light does delay your body clock — but for most people the bigger thief is what screens DO to your arousal, not just the wavelengths they emit. The practical stack is therefore layered: dim the room, switch to night mode, and stop feeds an hour before bed. Each layer helps; together they rebuild your wind-down.
Screen light matters less than what you do on screens — but the combination of bright light, engaging content and doomscrolling is a genuine sleep thief.
Evening light — blue-enriched especially — delays melatonin and shifts the clock later, but engaging content keeps arousal high too, so both matter.
It helps a little; dimming the whole room helps more; putting the screen down 30-60 minutes before bed helps most of all.
Reading a paper book or listening to an audiobook — calm, low-light, low-arousal activities beat any screen-based wind-down.
Every tool answers instantly from our own knowledge and calculators. Want the deeper, personalised version? Each has a $2.95 full report.