Twilight: Your Solution for Blue Light-Induced Sleep Problems

Struggling to fall asleep? Are your children overly active after tablet use before bed? Do you frequently use your smartphone or tablet late at night, or experience light sensitivity during migraines? Twilight might be the answer.

Emerging research indicates that pre-sleep exposure to blue light disrupts the natural circadian rhythm, hindering sleep. This is due to Melanopsin, a photoreceptor in the eye sensitive to blue light (460-480nm), which can suppress melatonin production—the hormone regulating sleep-wake cycles. Studies show that even a couple of hours of tablet or smartphone use before bed can delay sleep by an hour.

The Twilight app dynamically adjusts your device's screen to the time of day. After sunset, it filters blue light with a soft red filter, protecting your eyes. Filter intensity adjusts smoothly based on your sunrise and sunset times.

Twilight also works on Wear OS devices.

Key Features and Benefits:

• Improved Sleep: Reduces blue light exposure for better sleep.
• Reduced Eye Strain: Provides a gentler viewing experience, especially at night.
• Customizable Settings: Adjusts to your local sunrise and sunset times.
• Wear OS Compatibility: Syncs with your Wear OS device for consistent filtering.
• AMOLED Screen Friendly: Extensive testing shows no signs of screen burn-in or damage. May even extend AMOLED screen lifespan.
• App Control: Allows you to pause Twilight in specific apps.
• Smart Home Integration: Control Philips Hue lights to minimize blue light in your home environment.
• Accessibility Service: For enhanced filtering of notifications and lock screens (with privacy protections).
• Automation Support: Integrate with Tasker or similar apps for advanced control.

Learn More:

• Documentation: http://twilight.urbandroid.org/doc/
• Circadian Rhythm Information: 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
• Automation (Tasker): https://sites.google.com/site/twilight4android/automation
• Privacy Regarding Accessibility Service: https://twilight.urbandroid.org/is-twilights-accessibility-service-a-thread-to-my-privacy/

Supporting Research: (List of cited studies)

• Dijk, D.-J., et al. (2012). Amplitude Reduction and Phase Shifts of Melatonin, Cortisol and Other Circadian Rhythms after a Gradual Advance of Sleep and Light Exposure in Humans.
• Gooley, J. J., et al. (2011). Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans.
• Duffy, J. F., & Czeisler, C. A. (2009). Effect of Light on Human Circadian Physiology.
• Gronfier, C., et al. (2009). Efficacy of a single sequence of intermittent bright light pulses for delaying circadian phase in humans.
• Wright, K. P., et al. (2009). Intrinsic period and light intensity determine the phase relationship between melatonin and sleep in humans.
• Santhi, N., et al. (2008). The Impact of Sleep Timing and Bright Light Exposure on Attentional Impairment during Night Work.
• Zaidi, F. H., et al. (2007). Short-Wavelength Light Sensitivity of Circadian, Pupillary, and Visual Awareness in Humans Lacking an Outer Retina.

Download Twilight today and experience the difference!