Twilight

Twilight

(43367 ratings)

Appears in 25 channels

  • Downloads:
    500,000 - 1,000,000
  • Last update
    Jul 2, 2014

Twilight Reviews

  • Naga Girisa Nandan

    Naga Girisa Nandan

    Reviewed in Best apps for daily use

    Make your screen dim in the night and intensity and color capacities can be adjusted to get the nice matt effect with transperancy adjustment to your screen.

  • 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.

  • Marina Reinoso

    Marina Reinoso

    Reviewed in MBR Apps imprescindibles y súper customizables

    Tecnología que cuida tu salud! Twilight optimiza el brillo y la gama de colores de tu pantalla en función del horario y posición solar para no dañar tu vista ni perjudicar tu sueño.

  • Connor Sanders

    Connor Sanders

    Reviewed in Health and Fitness

    A great app to help you get sleep.

  • Arjun Temurnikar

    Arjun Temurnikar

    Reviewed in My Essentials

    Very handy app. It dims your screen with a slight tinge of red at night so that the screen is not so glaring bright. It's basically flux for android.

  • Zahra Ali

    Zahra Ali

    Reviewed in Best Apps And Games ッ

    Do u or your hyperactive kids use their tablets or mobile before they/you sleep? This app protects your eyes and you can sleep straight away go to the app to read more

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
- network - access smartlight (Philips HUE) to shield you household light from blue

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

Search for more evidence in many scientific articles and empirical studies online. Keywords: Circadian, Melatonin, Melanopsin, Light, Wavelength, Insomnia...
Similar to f.lux on Windows or Red Shift on Linux.