Twilight

Twilight

(31463 ratings)

Appears in 25 channels

  • Downloads:
    500,000 - 1,000,000
  • Last update
    Feb 26, 2014

Twilight Reviews

  • Jamie Davies

    Jamie Davies

    Reviewed in Long Lasting Apps & Games

    That harsh blue light straining your eyes at night? Make your phone warmer & more comfortable to look at with Twilight. Automatically changes intensity depending on your local time. Headaches & sore eyes will be a thing of the past.

  • Nicolas Epinette

    Nicolas Epinette

    Reviewed in Top Apps Android

    Health & Fitness

  • Debanka Chanda

    Debanka Chanda

    Reviewed in TT&T(Try,test and tell)

    I have been using it since a while now.in theory, its another screen filter app.But it filters out the blue light,and if you get a reddish hues in your screen.the blue light is said to cause strain to eye, leading to irregular sleeping .I am not sure of this theory, but ever since I got used to the reddish filter, I am using it every evening,and more than the screen dimming filter.

  • Giampi

    Giampi

    Reviewed in One (holo) app a day

    If you like me spend few mins in bed with the last internet updates install twilight. The developer claims you will sleep better. Not sure about it but definitely your eyes will be happy

  • Androfox

    Androfox

    Reviewed in Little helpers

    Helps getting sleep when using your phone before bed.

  • Pranav Ganapathiraju

    Pranav Ganapathiraju

    Reviewed in Things to Do, Places to Go…

    Don't let staying up late playing Angry Birds be the cause for loss of sleep. With this app, you get a software overlay on your screen, with a colour filter that gradually dims and brightens as the day passes. It's not as elaborate as Lux Auto Brightness. But, the simplicity of configuration feels better to me, personally. Also, the automatic mode is free. [Note: I don't play Angry Birds. I prefer Subway Surfers.]

  • Varna Sri Raman

    Varna Sri Raman

    Reviewed in Google Nexus Picks

    Changes ambient lighting on your device to red based on time of the day. Save your eyes.

  • Playboard Team

    Playboard Team

    Reviewed in Reddit Saturday APPreciation thread, Nov 23rd 2013

    syosyosyo: like fl.ux. this has helped me fall asleep so easily at night now despite my gadget use.

  • Simon John

    Simon John

    Reviewed in Must have apps for New android users

    If you get Eye Irritations when your using your phone at night this app changes the screen color from blue to red so you won't get irritated

Description

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Are you having troubles to fall 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 blue spectrum on 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.

Please read the 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 explained:
- location - to find out your current sunset/surise times
- running apps - to stop Twilight in selected apps
- write settings - to set back-light

Automation through Tasker or other:
https://sites.google.com/site/twilight4android/automation

Examples of 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, Jeanne F. Duffy, Edward J. Silva, Theresa L. Shanahan, Diane B. Boivin, Charles A. Czeisler 2012

Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans
Joshua J. Gooley, Kyle Chamberlain, Kurt A. Smith, Sat Bir S. Khalsa, Shantha M. W. Rajaratnam, Eliza Van Reen, Jamie M. Zeitzer, Charles A. Czeisler, Steven W. 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, Richard E. Kronauer, Megan E. Jewett, Charles A. Czeisler 2009

Intrinsic period and light intensity determine the phase relationship between melatonin and sleep in humans
Kenneth P. Wright, Claude Gronfier, Jeanne F. Duffy, Charles A. Czeisler 2009

The Impact of Sleep Timing and Bright Light Exposure on Attentional Impairment during Night Work
Nayantara Santhi, Daniel Aeschbach, Todd S. Horowitz, Charles A. Czeisler 2008

Short-Wavelength Light Sensitivity of Circadian, Pupillary, and Visual Awareness in Humans Lacking an Outer Retina
Farhan H. Zaidi, Joseph T. Hull, Stuart N. Peirson, Katharina Wulff, Daniel Aeschbach, Joshua J. Gooley, George C. Brainard, Kevin Gregory-Evans, Joseph F. Rizzo, III, Charles A. Czeisler, Russell G. Foster, Merrick J. Moseley, Steven W. Lockley. 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, Richard E Kronauer, Emery N Brown, Charles A Czeisler 2000

Phase-shifting human circadian rhythms: influence of sleep timing, social contact and light exposure
J F Duffy, R E Kronauer, C A Czeisler 1996

Search for more evidence in many scientific articles and empirical studies online. Keywords: Circadian, Melatonin, Melanopsin, Light, Wavelength...

Similar to f.lux on Windows or Red Shift on Linux.

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