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Minggu, 22 Juni 2014

Twilight 3.4 APK

Download Twilight 3.4 APK for your Android phone.

Current Version: 3.4

Requires Android: 2.1 and up

Category: Health & Fitness

v3.4 update:

3.3

- filter time modes – Always/Sun/Alarm/Custom

- Custom mode now available in free version

- Visual indicator of filter times

- Partial support for non-Sleep as Android alarm clocks

- Better support for Sleep as Android – Bedtime to alarm filter times

- more high res bitmaps


Overview:

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://ift.tt/MUTSTh

http://ift.tt/18bWgyu

http://ift.tt/18bWeXp

http://ift.tt/18bWeXq


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:

http://ift.tt/1pIV4ip


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.



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