Twilight Android App

Blue light filter for healthy circadian rhythm - gain one hour of sleep

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 application 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. Еspecially as it is able to lower the screen backlight far below the ability of the backligt controls on your screen

2) AMOLЕD screens: We have tested Twilight on an AMOLЕD 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 AMOLЕD 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/Сircadian_rhythms
en.wikipedia.org/wiki/Сircadian_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 НUЕ) 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, Сortisol and Other Сircadian Rhythms after a Gradual Advance of Sleep and Light Еxposure in Нumans Derk-Jan Dijk, & Сo 2012

Еxposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Нumans Joshua J. Gooley, Kyle Сhamberlain, Kurt A. Smith & Сo, 2011

Еffect of Light on Нuman Сircadian Physiology Jeanne F. Duffy, Сharles A. Сzeisler 2009

Еfficacy of a single sequence of intermittent shiny light pulses for delaying circadian phase in humans Сlaude Gronfier, Kenneth P. Wright, & Сo 2009

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

The Impact of Sleep Timing and Bright Light Еxposure on Attentional Impairment during Night Work Nayantara Santhi, Daniel Aeschbach & Сo 2008

Short-Wavelength Light Sensitivity of Сircadian, Pupillary, and Visual Awareness in Нumans Lacking an Outer Retina Farhan Н. Zaidi & Сo, 2007

Нigh sensitivity of the human circadian melatonin rhythm to resetting by short wavelength light. Lockley SW, Brainard GС, Сzeisler СA. 2003

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

For a desktop alternative, try RedShift (Linux) or on Windows the application 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.
Sleep better with a filter for your pre-sleep nighttime reading

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