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Are you having trouble falling asleep? Are your kids hyperactive when playing with the tablet before bed time?

Are you using your smart phone or tablet in the late evening? Twilight may be a solution for you!

WARNING: Android O does no allow the app to cover your notifications any more..

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.

Documentation

Doc

Get more from Twilight
1) Bed reading: Twilight is more pleasant on the eyes for night reading. Especially as it is able to lower the screen backlight far below the ability of the backligt controls on your screen

2) AMOLED screens: We have tested Twilight on an AMOLED screen for 2.5 years without any sign of depletion or over-burning. If properly configured Twilight causes less light emission (by enabling dimming) with more equal light distribution (dark areas of the screen such as the status bar get tinted). This may in fact increase your AMOLED screen life time.

Basics on circadian rhythm and the role of melatonin
http://en.wikipedia.org/wiki/Melatonin
http://en.wikipedia.org/wiki/Melanopsin
http://en.wikipedia.org/wiki/Circadian_rhythms
http://en.wikipedia.org/wiki/Circadian_rhythm_disorder

Permissions
– location – to find out your current sunset/surise times
– running apps – to stop Twilight in selected apps
– write settings – to set back-light
– network – access smartlight (Philips HUE) to shield you household light from blue

Automation (Tasker or other)
https://sites.google.com/site/twilight4android/automation

Related scientific research

Amplitude Reduction and Phase Shifts of Melatonin, Cortisol and Other Circadian Rhythms after a Gradual Advance of Sleep and Light Exposure in Humans Derk-Jan Dijk, & Co 2012

Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans Joshua J. Gooley, Kyle Chamberlain, Kurt A. Smith & Co, 2011

Effect of Light on Human Circadian Physiology Jeanne F. Duffy, Charles A. Czeisler 2009

Efficacy of a single sequence of intermittent bright light pulses for delaying circadian phase in humans Claude Gronfier, Kenneth P. Wright, & Co 2009

Intrinsic period and light intensity determine the phase relationship between melatonin and sleep in humans Kenneth P. Wright, Claude Gronfier & Co 2009

The Impact of Sleep Timing and Bright Light Exposure on Attentional Impairment during Night Work Nayantara Santhi & Co 2008

Short-Wavelength Light Sensitivity of Circadian, Pupillary, and Visual Awareness in Humans Lacking an Outer Retina Farhan H. Zaidi & Co, 2007

High sensitivity of the human circadian melatonin rhythm to resetting by short wavelength light. Lockley SW & Co. 2003

Sensitivity of the human circadian pacemaker to nocturnal light: melatonin phase resetting and suppression Jamie M Zeitzer, Derk-Jan Dijk & Co 2000

For a desktop alternative, try RedShift (Linux) or on Windows the app which has no relation to this project whatsoever, whose name cannot be said aloud or whispered as it is a Trademark, lets call it Lord Voldemort of the blue light flux filtering apps.Guessed it? Let us know in the comments.

Category: Health & Fitness
Operating System: Android
Price: Free

WHAT’S NEW

fix for adaptive con on Pixels
new translations (many thanks)

User Reviews/Opinion:

  • Dear developers: I have adored this app for years on my s5. I just updated to an s8, and had it still working perfectly Until I updated the android software last night. Now, it doesn’t draw over the status bar at the top of the screen, or the navigation bar on the right hand side. It results in bright, bright light straight to my face during nighttime while trying to use my phone. I have gone through twilight settings looking for a fix to no avail. Please solve this issue, or guide me to fix it. I miss not having this issue, and will need to start looking at other apps if it is not solved.
  • Incredible! I originally downloaded Twilight to help me fall asleep easier, but it came with the completely unexpected benefit of drastically helping my migraines. It’s been a total game changer for me. I keep the filters on all day long unless I’m in direct sunlight and need the extra brightness to see. Very simple interface, and lots of customization.
  • The program is great, but there are other apps/programs that will not work while twilight is active. Some fix, just to pause twilight, but it would be great if they could figure a way to play nice with the password entry pages on some websites/apps/programs. That’s the only time it does not work. July 2018 update: Still having issues after the recent update. Cannot use twilight and Facebook app together. That’s actually ok. Just a heads up.

Twilight file information

Package name: com.urbandroid.lux
Version: 9.0 (280)
File size: 5.8 MB
Updated: August 18, 2018
Minimum Android version: Android 4.0 (Ice Cream Sandwich, API 14)

Old Versions

Twilight 8.3

Package name: com.urbandroid.lux
Version: 8.3 (275)
File size: 5.7 MB
Uploaded: May 29, 2018
Minimum Android version: Android 4.0 (Ice Cream Sandwich, API 14)

Twilight 8.3

Package name: com.urbandroid.lux
Version: 8.3 (273)
File size: 5.7 MB
Uploaded: May 19, 2018
Minimum Android version: Android 4.0 (Ice Cream Sandwich, API 14)

Twilight 8.2

Package name: com.urbandroid.lux
Version: 8.2 (271)
File size: 5.7 MB
Uploaded: March 15, 2018
Minimum Android version: Android 4.0 (Ice Cream Sandwich, API 14)

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