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Download Twilight: Blue light filter (Wear OS) 12.2 APK
Target: Android 10 (Q, API 29)
What's new in Twilight: Blue light filter (Wear OS) 12.2
- Support for new background location requirements, Wear OS 2.0 app install support
About Twilight: Blue light filter (Wear OS) 12.2
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!
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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
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
en.wikipedia.org/wiki/Melatonin
en.wikipedia.org/wiki/Melanopsin
en.wikipedia.org/wiki/Circadian_rhythms
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)
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
Twilight: Blue light filter (Wear OS) 12.2 variants
This release may come in several variants. Consult our handy FAQ to see which download is right for you.
These require Wear OS and can not be installed on your phone or tablet.
Version:12.2
Uploaded:January 20, 2021 at 8:49AM UTC
File size:6.02 MB
Downloads:44
Version:14.1
Uploaded:August 27, 2024 at 7:01AM UTC
File size:8.16 MB
Version:13.4(516) for Android 6.0+ (Marshmallow, API 23)
Uploaded:June 30, 2023 at 5:29PM UTC
File size:2.26 MB
Downloads:19
Version:13.2(498) for Android 6.0+ (Marshmallow, API 23)
Uploaded:November 29, 2022 at 4:51PM UTC
File size:1.79 MB
Downloads:41
Version:12.5(436) for Android 6.0+ (Marshmallow, API 23)
Uploaded:May 14, 2021 at 10:35AM UTC
File size:1.74 MB
Downloads:83
Version:12.3(425) for Android 6.0+ (Marshmallow, API 23)
Uploaded:January 25, 2021 at 12:38PM UTC
File size:1.8 MB
Downloads:46
Version:12.2(422) for Android 6.0+ (Marshmallow, API 23)
Uploaded:January 21, 2021 at 4:36AM UTC
File size:1.8 MB
Downloads:23
Version:14.0
Uploaded:June 3, 2024 at 8:27PM UTC
File size:7.64 MB
Downloads:16
Version:13.8
Uploaded:October 24, 2023 at 10:43AM UTC
File size:2.42 MB
Downloads:48
Version:13.4
Uploaded:June 30, 2023 at 5:29PM UTC
File size:2.26 MB
Downloads:19
Version:13.2
Uploaded:November 29, 2022 at 4:51PM UTC
File size:1.79 MB
Downloads:41
Version:12.5
Uploaded:May 14, 2021 at 10:35AM UTC
File size:1.74 MB
Downloads:83
Version:12.3
Uploaded:January 25, 2021 at 12:38PM UTC
File size:1.8 MB
Downloads:46
Version:12.2
Uploaded:January 21, 2021 at 4:36AM UTC
File size:1.8 MB
Downloads:23
