While blue light has the most impact, it&#x27;s all light that has this effect. For anyone interested, I&#x27;d recommend reading this concise 4 page study on the subject.[0]<p>The synopsis is that there&#x27;s no substitute for shutting off screens 1-2 hours before bedtime. This coming from someone who not only uses f.lux but sometimes when needing to use the computer late, will adorn an old pair of sunglasses to further cut down on light from 3 monitors.<p>[0]<a href="https:&#x2F;&#x2F;www.gwern.net&#x2F;docs&#x2F;melatonin&#x2F;2012-wood.pdf" rel="nofollow">https:&#x2F;&#x2F;www.gwern.net&#x2F;docs&#x2F;melatonin&#x2F;2012-wood.pdf</a>