I used f.lux on my PC for a year or two but ultimately removed it because it occasionally caused the screen to flash (can&#x27;t recall but probably on sleep &#x2F; wake-up &#x2F; UAC actions). Sometimes it would stop working altogether. If I were Apple, I&#x27;d be skeptical before allowing a low level driver access to an app that can potentially affect the device experience. I&#x27;d want to test it to death &amp; be damn sure that the benefits outweigh the cost of allowing it.<p>On a related note, the linked BBC article talks about phones needing a &quot;bed mode&quot; to &quot;protect sleep&quot;. If you are really struggling with eye strain &#x2F; disturbed sleep, a better advice would be to turn away your gadgets well before bed time and avoid the compulsive behavior of reading on your phone all the time. I tried f.lux along with better ambient lighting, screen dimming etc. (suggestions found on HN). The benefits were marginal. I would still wake up with groggy eyes &amp; felt sluggish until I experimented with the rule of &quot;no gadgets after dinner&quot;. That helped way more.<p>Don&#x27;t get me wrong, it may be an awesome piece of software for those who <i>have</i> to be in front of the screen for longer duration.