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

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

Apps APK (Android Package Kit) is the file format used to distribute and install applications on Android devices. It's the equivalent of an EXE file on Windows or a DMG file on macOS. Best twilight blue light filter for android APK files contain all the necessary elements for an Android app to be installed on a device.

Here are some key points about twilight blue light filter APK Apps Apps files:

1. Installation Apps APK: You can install an twilight blue light filter APK file on an Android device by either downloading it directly to the device or transferring it from a computer twilight blue light filter android download. However, keep in mind that installing Apps apps from unknown sources may pose security risks, as they haven't been vetted by the official app stores (Google Play Store).

2. Source Apps APK: APK files are usually obtained from the Google Play Store, but they can also be downloaded from other sources. It's important to be cautious when downloading Apps APKs from third-party websites, as they may contain malicious software.

3. Permissions Apps APK: When you install an app via an APK file, you might be asked to grant certain permissions to the app. Be sure to review the permissions requested by the app to ensure they are reasonable and necessary for the Apps app's functionality.

4. Updates Apps APK: Apps installed via APK files may not receive automatic updates from the Google Play Store. You'll need to manually update the app by downloading and installing the latest twilight blue light filter android APK file.

5. Compatibility Apps APPS: APK files are designed for Android devices. They won't work on iOS devices (like iPhones and iPads) because iOS uses a different file format for Apps installations.

If you have a specific Apps APK file and you're looking for information about it, such as its source, purpose, or safety, it's crucial to exercise caution and, if possible, verify the legitimacy of the file before installation. Additionally, be aware of the potential security risks associated with twilight blue light filter download Apps apps from unknown sources.

Sep 16, 2021