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Twilight

Twilight

4.9 (150)

Health & Fitness | 5.6MB

Price: $Free

Explanation

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Description

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.
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.
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, Daniel Aeschbach & 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, Brainard GC, Czeisler CA. 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.

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What's New

8.0
- Black quick settings tile panel with Android 8.1 and home screen filtering enabled
- various fixes in wallpaper filtering
- Because of wallpaper filtering the app may require the storage permission on some phones, but if you are not using this you can revoke the permission after updating
- get rid of Accessibility option for auto-pause in apps as of new Play Store policies (if you are still using this, please re-configure)

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Information

Update: 2017-12-15

Version: 8.1

Requires: Android4.0 or later

Rate

(150)

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User Review

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It's been helping me get to sleep and eases with strain after staring at a computer all day.
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With this app, I can now look at my phone at night without killing my eyes.
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I have problem when I go to sleep due to having my books on my phone and I can read for hours into the night. With twilight, the red glow helps me feel in tune my body. Telling me that I need to sleep. I would recommend this app for the night owls who needs help going to bed.
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I love this app!!! I put this on every night after-dinner so it doesn't intetupt my sleep wake cycle. The red light it gives off prevents me from getting headachrs. Great app!!!!!
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I may not be using it for its intended purpose, but without this app my S7 Edge would be useless to me. With Twilight I can compensate the dark horizontal bands created by S7 faulty hardware. Thank you Twilight.
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Can you please tell me why Twilight requires access to photos and media files?
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Keep switching the wallpaper to the default one on Android O, when wallpaper filtering is enabled, please fix the problem.
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Amazing screen filter app. Really helps with eye strain. Especially since you use phones all the time
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When I click on 'more setting' then it tells 'unfortunately twilight is stoped'. Please solve this problem.
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Awesome until you decided to want access to my SD card. Feature creep and permission grabbing is not appreciated. Will now search for one with no SD access requested.
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User Review

Newest
    avatar
    11/14/2017
    With this app, I can now look at my phone at night without killing my eyes.
    avatar
    11/14/2017
    I love this app!!! I put this on every night after-dinner so it doesn't intetupt my sleep wake cycle. The red light it gives off prevents me from getting headachrs. Great app!!!!!
    avatar
    11/14/2017
    Can you please tell me why Twilight requires access to photos and media files?
    avatar
    11/14/2017
    Amazing screen filter app. Really helps with eye strain. Especially since you use phones all the time
    avatar
    11/14/2017
    Awesome until you decided to want access to my SD card. Feature creep and permission grabbing is not appreciated. Will now search for one with no SD access requested.
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    11/13/2017
    Best red light filter app! Very customizable, easy to pause and resume when needed.
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    11/13/2017
    Amazing screen filter app! Most problems are caused by Android Updates which gives it a bad rep sometimes.
    avatar
    11/13/2017
    Hello I Paid for Pro Version But I didn't get Money Is deducted from my account Help me Thank You

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