Twilight app


We take a look at Twilight, the Android app that automatically adjusts your device’s brightness throughout the day, reducing the harsh light as your eyes grow tired…

The sleep-inhibiting impact of blue light from computer devices has been filling column inches lately. Beavering away on smartphones and tablets near bedtime, say experts, can suppress the production of melatonin – the hormone responsible for a healthy sleep-wake cycle. For the midnight-oil-burning business community, it’s yet another path to a restless night and subsequent not-too-sharp working day.

Little wonder, then, that Apple’s beta version of iOS 9.3 contains a new ‘Night Shift’ mode, which automatically changes the screen colour according to the time of day. For Android, meanwhile, there’s the free Twilight app, which does a similar job – locating your timezone and bringing a soothing red hue to the display from dusk to dawn. This reviewer certainly slumbered soundly during the trial and, whether that’s proof of concept or placebo effect, will certainly be keeping it activated from now on.

What the developer says

Recent research suggests that exposure to blue light before sleep may distort your natural (circadian) rhythm and cause inability to fall asleep.

The cause is the photoreceptor in your eyes, called Melanopsin. This receptor is sensitive to a narrow band of blue light in the 460-480nm range which may suppress Melatonin production – a hormone responsible for your healthy sleep-wake cycles.

In experimental scientific studies it has been shown an average person reading on a tablet or smart phone for a couple of hours before bed time may find their sleep delayed by about an hour.

The Twilight app makes your device screen adapt to the time of the day. It filters the flux of blue light emitted by your phone or tablet after sunset and protects your eyes with a soft and pleasant red filter. The filter intensity is smoothly adjusted to the sun cycle based on your local sunset and sunrise times.

Twilight is free to download from Google Play

For more visit the developer’s site.


About author

Alexander Parker

Alexander Parker

Alexander Parker is a freelance writer and filmmaker.

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