Twilight

<p><br /> Are you having troubles to fall asleep? Are your kids hyperactive when playing with the tablet before bed time?<br /><br /> Are you using your smart phone or tablet in the late evening? Twilight may be a solution for you!</p>
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<p><br /> Recent research suggests that exposure to blue light before sleep may distort your natural (circadian) rhythm and cause inability to fall asleep.</p>
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<p><br /> 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.</p>
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<p><br /> 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.</p>
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<p><br /> 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.</p>
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<p><br /> Please read the basics on circadian rhythm and the role of melatonin:</p>
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<p><br /> <a href="https://www.google.com/url?q=http://en.wikipedia.org/wiki/Melatonin&sa=D... target="_blank">http://en.wikipedia.org/wiki/Melatonin</a><br /><br /> <a href="https://www.google.com/url?q=http://en.wikipedia.org/wiki/Melanopsin&sa=... target="_blank">http://en.wikipedia.org/wiki/Melanopsin</a><br /><br /> <a href="https://www.google.com/url?q=http://en.wikipedia.org/wiki/Circadian_rhyt... target="_blank">http://en.wikipedia.org/wiki/Circadian_rhythms</a><br /><br /> <a href="https://www.google.com/url?q=http://en.wikipedia.org/wiki/Circadian_rhyt... target="_blank">http://en.wikipedia.org/wiki/Circadian_rhythm_disorder</a></p>
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<p><br /> Examples of related scientific research:</p>
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<p><br /> Amplitude Reduction and Phase Shifts of Melatonin, Cortisol and Other Circadian Rhythms after a Gradual Advance of Sleep and Light Exposure in Humans<br /><br /> Derk-Jan Dijk, Jeanne F. Duffy, Edward J. Silva, Theresa L. Shanahan, Diane B. Boivin, Charles A. Czeisler 2012</p>
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<p><br /> Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans<br /><br /> 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</p>
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<p><br /> Effect of Light on Human Circadian Physiology<br /><br /> Jeanne F. Duffy, Charles A. Czeisler 2009</p>
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<p><br /> Efficacy of a single sequence of intermittent bright light pulses for delaying circadian phase in humans<br /><br /> Claude Gronfier, Kenneth P. Wright, Richard E. Kronauer, Megan E. Jewett, Charles A. Czeisler 2009</p>
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<p><br /> Intrinsic period and light intensity determine the phase relationship between melatonin and sleep in humans<br /><br /> Kenneth P. Wright, Claude Gronfier, Jeanne F. Duffy, Charles A. Czeisler 2009</p>
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<p><br /> The Impact of Sleep Timing and Bright Light Exposure on Attentional Impairment during Night Work<br /><br /> Nayantara Santhi, Daniel Aeschbach, Todd S. Horowitz, Charles A. Czeisler 2008</p>
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<p><br /> Short-Wavelength Light Sensitivity of Circadian, Pupillary, and Visual Awareness in Humans Lacking an Outer Retina<br /><br /> 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</p>
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<p><br /> High sensitivity of the human circadian melatonin rhythm to resetting by short wavelength light.<br /><br /> Lockley SW, Brainard GC, Czeisler CA. 2003</p>
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<p><br /> Sensitivity of the human circadian pacemaker to nocturnal light: melatonin phase resetting and suppression<br /><br /> Jamie M Zeitzer, Derk-Jan Dijk, Richard E Kronauer, Emery N Brown, Charles A Czeisler 2000</p>
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<p><br /> Phase-shifting human circadian rhythms: influence of sleep timing, social contact and light exposure<br /><br /> J F Duffy, R E Kronauer, C A Czeisler 1996</p>
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<p><br /> Exposure to bright light and darkness to treat physiologic maladaptation to night work.<br /><br /> Czeisler CA, Johnson MP, Duffy JF, Brown EN, Ronda JM, Kronauer RE. 1990</p>
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<p><br /> Search for more evidence in many scientific articles and empirical studies online. Keywords: Circadian, Melatonin, Melanopsin, Light, Wavelength...</p>
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