Dimming Lights 90 Minutes Before Bed Increases REM Sleep by 18 Percent

What was said

"90 minutes before bed, they turned down the lights to below 30 lux and they pulled out all of the blue light. And just that trick of dropping the lights down 90 minutes before bed, below 30 lux, making it warm yellow light, increased their REM sleep by 18%."

Walker presented research showing a simple environmental intervention—reducing light levels below 30 lux and removing blue light 90 minutes before bed—produced an 18% increase in REM sleep. This non-pharmaceutical approach demonstrates the significant impact of light exposure on sleep quality, countering the trend toward supplement and medication use for sleep issues.