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Twilight icon

Twilight

Blue light filter
12.11 for Android

The description of Twilight App

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!

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. See references below..

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
http://twilight.urbandroid.org/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 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

Accessibility Service

In order to filter also your notifications and lock screen the app may ask for enabling Twilight Accessibility Service. The app uses this service only to better filter your screen and does not collect any personal information. Please read more about this at https://twilight.urbandroid.org/is-twilights-accessibility-service-a-thread-to-my-privacy/

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: Jamie M Zeitzer, Derk-Jan Dijk & Co 2000
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Twilight App 12.11 Update

2021-10-14
- Fix for pausing times larger than 1 minute
- Several warnings and guidance on recent Play Store secured buttons

Twilight Tags

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Additional App Information

Previous versions
  • V12.11 6.5 MB APK

    Twilight

    2021-10-14

    Twilight 12.11 (459)

    Update on: 2021-10-14

    App uploaded by: Mahmad Khatab

    Requires Android: Android 4.1+ (Jelly Bean, API 16)

    Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight 12.11(459) safe verified

    Screen DPI: nodpi

    Architecture: universal

    File SHA1: e12733e7dfcdf3aa5578443ee2635e58f384ce9c

    File Size: 6.5 MB

    What's new:

    Download

  • V12.9 6.3 MB APK

    Twilight

    2021-09-06

    Twilight 12.9 (456)

    Update on: 2021-09-06

    App uploaded by: عباس مخلد

    Requires Android: Android 4.1+ (Jelly Bean, API 16)

    Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight 12.9(456) safe verified

    Screen DPI: nodpi

    Architecture: universal

    File SHA1: 8a666dc9c29af3e60a137587f0ded6d233bf3fb0

    File Size: 6.3 MB

    What's new:

    Download

  • V12.6 6.3 MB APK

    Twilight

    2021-06-29

    Twilight 12.6 (441)

    Update on: 2021-06-29

    App uploaded by: روعة الحياة ام محمد

    Requires Android: Android 4.1+ (Jelly Bean, API 16)

    Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight 12.6(441) safe verified

    Screen DPI: nodpi

    Architecture: universal

    File SHA1: 442c68c24888c9b9541049185530a36bf00e9993

    File Size: 6.3 MB

    What's new:

    Download

  • V12.5 6.3 MB APK

    Twilight

    2021-05-25

    Twilight 12.5 (439)

    Update on: 2021-05-25

    App uploaded by: عباس مخلد

    Requires Android: Android 4.1+ (Jelly Bean, API 16)

    Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight 12.5(439) safe verified

    Screen DPI: nodpi

    Architecture: universal

    File SHA1: c397552b9b69f594b1fd281085ad6f3788d11539

    File Size: 6.3 MB

    What's new:

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  • V12.3 6.0 MB APK

    Twilight

    2021-05-11

    Twilight 12.3 (426)

    Update on: 2021-05-11

    App uploaded by: روعة الحياة ام محمد

    Requires Android: Android 4.1+ (Jelly Bean, API 16)

    Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight 12.3(426) safe verified

    Screen DPI: nodpi

    Architecture: universal

    File SHA1: cd4f556e00c86baad0418b8d9c88504c8001d1e0

    File Size: 6.0 MB

    What's new:

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  • V12.2 6.0 MB APK

    Twilight

    2021-01-22

    Twilight 12.2 (423)

    Update on: 2021-01-22

    App uploaded by: روعة الحياة ام محمد

    Requires Android: Android 4.1+ (Jelly Bean, API 16)

    Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight 12.2(423) safe verified

    Screen DPI: nodpi

    Architecture: universal

    File SHA1: 6284098ddfd9794d663ab5e5e594aa22905f8f7d

    File Size: 6.0 MB

    What's new:

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