Twilight Pro Unlock 2.2

Are you struggling to fall asleep? Do your children become hyperactive when using a tablet before bedtime? Utilizing your smartphone or tablet late in the evening? Twilight might offer a solution for you.

Recent studies indicate that exposure to blue light before sleep can disrupt your natural circadian rhythm, leading to difficulties in falling asleep. This disruption is caused by the photoreceptor in your eyes, known as Melanopsin. This receptor is sensitive to a specific range of blue light (460-480nm), which can inhibit the production of Melatonin - a hormone essential for maintaining healthy sleep-wake cycles.

Experimental research has demonstrated that individuals who read on a tablet or smartphone for several hours before bedtime may experience a delay in their sleep onset by approximately an hour.

The Twilight app adjusts your device screen according to the time of day. It filters out the blue light spectrum on your phone or tablet after sunset and provides protection for your eyes with a gentle red filter. The filter's intensity is seamlessly adjusted based on your local sunset and sunrise times.

• PRO features include:
  • More than 2 predefined profiles
  • Adjustable transition time
  • Option to disable Twilight service during inactive periods
  • New features are often introduced first in PRO

We appreciate your support for our development efforts. This Twilight app version is designated as a professional application. Please install it on top without uninstalling the existing Twilight version.

For more information on circadian rhythm and the role of melatonin, please refer to the following resources:

• Melatonin
• Melanopsin
• Circadian rhythms
• Circadian rhythm disorder

Explore some 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)