THE PERILS of blue light on the circadian rhythms has become a well-known problem, and there are several ways to combat this, such as the Adlens glasses we reviewed recently.
The theory goes that the blue light emitted by devices is so like daylight that it prevents the production of melatonin, which tells the body that it's time to get sleepy.
There have been arguments about how true this is, and whether it's the blue light or gadgets in general, but the fact is that if you look at a gadget for 15 minutes late at night it's equivalent to having a cup of coffee.
The original and probably still the best software solution for this is F.lux, a Windows app that doesn't just cover the blue light with a filter, but mathematically extracts it from each pixel at a GPU level.
Just using a filter causes double trouble because it triggers some security protocols that make stuff stop working, plus it doesn't actually remove the blue, it just masks it.
F.lux has thus far been available only for Windows, OS X, iOS and Linux. The company had claimed that it would not be able to recreate the technology on Android, but today an Android version has emerged.
However, there's a catch. You'll need a rooted phone. As with many of the best apps, it requires functionality that is locked down for Android users out of the box.
If you're cool with that (remember it will probably block some streaming services and banking apps) you can request to be part of the beta on the F.lux Forum.
We've asked F.lux whether the root requirement will be removed at a later date, and whether the app will reach the Google Play store, and will let you know what they come back with.
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