- Subtle blue light blockers are not effective. You need to block out 99% - blue light glasses 9pm, 3 hours before bedtime - https://geoffmobile.com/blog/how-effective-are-blue-light-blocking-glasses-for-reducing-time-to-fall-asleep-i-find-very-good - https://www.avivahealth.com/products/uvex-glasses?variant=12399875686494 - used in peer-reviewed research on the glasses