It&#x27;s free and not obviously harmful and has a plausible biological rationale, but if you think it may not work, it&#x27;s easy to run your own self-experiment: stick it in a little randomized script and record when you go to bed for, say, 50 days and see. That&#x27;s what I did with Redshift: <a href="http:&#x2F;&#x2F;www.gwern.net&#x2F;Zeo#redshiftf.lux" rel="nofollow">http:&#x2F;&#x2F;www.gwern.net&#x2F;Zeo#redshiftf.lux</a>