Twilight

Twilight

(73123 ratings)

Appears in 25 channels

  • Downloads:
    1,000,000 - 5,000,000
  • Last update
    Jan 15, 2015

Twilight Reviews

  • Nick Saunders

    Nick Saunders

    Reviewed in Apptastic Fantastic!

    Like flux but simpler to use and seems to genuinely help me sleep.

  • 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.

  • NA NA NANCAY

    NA NA NANCAY

    Reviewed in Apps THAT I NEED

    INTERFACE : 10/10 You don't REALLY need a good interface for an app like this, because you won't have to look at it all the time. It basically tints the screen red, and you can adjust how STRONG the red is and HOW DIM it is. If you value your sleep and your eyes, apparently this saves hours of sleep at night so your mind isn't agitated by all the bright lights. GET THIS NOW!

  • Jack Kenyon

    Jack Kenyon

    Reviewed in Apps to Install on Every New Device

    Twilight is the f.lux for your phone. It adds an overlay filter to your screen, and as the day progresses, it will filter out a customizable amount of the frequency of blue light that keeps you awake at night.

  • Jayesh Bhagchandani

    Jayesh Bhagchandani

    Reviewed in Insanely Awesomely Good Looking Apps

    Reduce the eye strain.

  • Moira

    Moira

    Reviewed in Amazing apps

    Screen dimmer

  • Rands Roid

    Rands Roid

    Reviewed in Rands Roid

    Who knows if it works... Who cares, it's free! If ya not gettin the sleep you deserve.. they say a little "twilight" will do the trick

  • Naga Girisa Nandan

    Naga Girisa Nandan

    Reviewed in Intresting apps and games

    Like matte. It makes screen dim. Eye protection from light focus. By buying donate version you can set the mode at various times

  • Khaled Trad

    Khaled Trad

    Reviewed in Awesome Android apps - daily updates

    app that automatically adjusts your device's brightness (or really, color temperature) over the course of the day, reducing the harsh whites and blues as the day progresses.

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 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. 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 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 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, Daniel Aeschbach & 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, 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 & Co 2000

For a desktop alternative, try RedShift (Linux) or on Windows the app 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.