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Description
Are you having trouble falling asleep? Areyour kids hyperactive when playing with the tablet before bedtime?
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 sleepmay distort your natural (circadian) rhythm and cause inability tofall asleep.
The cause is the photoreceptor in your eyes, called Melanopsin.This receptor is sensitive to a narrow band of blue light in the460-480nm range which may suppress Melatonin production - a hormoneresponsible for your healthy sleep-wake cycles.
In experimental scientific studies it has been shown an averageperson reading on a tablet or smart phone for a couple of hoursbefore bed time may find their sleep delayed by about anhour.
The Twilight app makes your device screen adapt to the time of theday. It filters the flux of blue light emitted by your phone ortablet after sunset and protects your eyes with a soft and pleasantred filter. The filter intensity is smoothly adjusted to the suncycle based on your local sunset and sunrise times.
Get more from Twilight
1) Bed reading: Twilight is more pleasant on the eyes for nightreading. Especially as it is able to lower the screen backlight farbelow the ability of the backligt controls on your screen
2) AMOLED screens: We have tested Twilight on an AMOLED screen for2.5 years without any sign of depletion or over-burning. Ifproperly configured Twilight causes less light emission (byenabling dimming) with more equal light distribution (dark areas ofthe screen such as the status bar get tinted). This may in factincrease 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 householdlight from blue
Automation (Tasker or other)
https://sites.google.com/site/twilight4android/automation
Related scientific research
Amplitude Reduction and Phase Shifts of Melatonin, Cortisol andOther Circadian Rhythms after a Gradual Advance of Sleep and LightExposure in Humans Derk-Jan Dijk, & Co 2012
Exposure to Room Light before Bedtime Suppresses Melatonin Onsetand Shortens Melatonin Duration in Humans Joshua J. Gooley, KyleChamberlain, 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 pulsesfor delaying circadian phase in humans Claude Gronfier, Kenneth P.Wright, & Co 2009
Intrinsic period and light intensity determine the phaserelationship between melatonin and sleep in humans Kenneth P.Wright, Claude Gronfier & Co 2009
The Impact of Sleep Timing and Bright Light Exposure on AttentionalImpairment during Night Work Nayantara Santhi, Daniel Aeschbach& Co 2008
Short-Wavelength Light Sensitivity of Circadian, Pupillary, andVisual Awareness in Humans Lacking an Outer Retina Farhan H. Zaidi& Co, 2007
High sensitivity of the human circadian melatonin rhythm toresetting 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-JanDijk & Co 2000
For a desktop alternative, try RedShift (Linux) or on Windows theapp which has no relation to this project whatsoever, whose namecannot be said aloud or whispered as it is a Trademark, lets callit Lord Voldemort of the blue light flux filtering apps.Guessed it?Let us know in the comments.
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 sleepmay distort your natural (circadian) rhythm and cause inability tofall asleep.
The cause is the photoreceptor in your eyes, called Melanopsin.This receptor is sensitive to a narrow band of blue light in the460-480nm range which may suppress Melatonin production - a hormoneresponsible for your healthy sleep-wake cycles.
In experimental scientific studies it has been shown an averageperson reading on a tablet or smart phone for a couple of hoursbefore bed time may find their sleep delayed by about anhour.
The Twilight app makes your device screen adapt to the time of theday. It filters the flux of blue light emitted by your phone ortablet after sunset and protects your eyes with a soft and pleasantred filter. The filter intensity is smoothly adjusted to the suncycle based on your local sunset and sunrise times.
Get more from Twilight
1) Bed reading: Twilight is more pleasant on the eyes for nightreading. Especially as it is able to lower the screen backlight farbelow the ability of the backligt controls on your screen
2) AMOLED screens: We have tested Twilight on an AMOLED screen for2.5 years without any sign of depletion or over-burning. Ifproperly configured Twilight causes less light emission (byenabling dimming) with more equal light distribution (dark areas ofthe screen such as the status bar get tinted). This may in factincrease 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 householdlight from blue
Automation (Tasker or other)
https://sites.google.com/site/twilight4android/automation
Related scientific research
Amplitude Reduction and Phase Shifts of Melatonin, Cortisol andOther Circadian Rhythms after a Gradual Advance of Sleep and LightExposure in Humans Derk-Jan Dijk, & Co 2012
Exposure to Room Light before Bedtime Suppresses Melatonin Onsetand Shortens Melatonin Duration in Humans Joshua J. Gooley, KyleChamberlain, 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 pulsesfor delaying circadian phase in humans Claude Gronfier, Kenneth P.Wright, & Co 2009
Intrinsic period and light intensity determine the phaserelationship between melatonin and sleep in humans Kenneth P.Wright, Claude Gronfier & Co 2009
The Impact of Sleep Timing and Bright Light Exposure on AttentionalImpairment during Night Work Nayantara Santhi, Daniel Aeschbach& Co 2008
Short-Wavelength Light Sensitivity of Circadian, Pupillary, andVisual Awareness in Humans Lacking an Outer Retina Farhan H. Zaidi& Co, 2007
High sensitivity of the human circadian melatonin rhythm toresetting 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-JanDijk & Co 2000
For a desktop alternative, try RedShift (Linux) or on Windows theapp which has no relation to this project whatsoever, whose namecannot be said aloud or whispered as it is a Trademark, lets callit Lord Voldemort of the blue light flux filtering apps.Guessed it?Let us know in the comments.
