Twilight Blue light filter for better sleep Pro APK 11.4
Urbandroid (Petr NÃ¡levka)
Recent research suggests that exposure to blue light before sleep can distort the natural (circadian) rhythm and cause an 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 460-480 nm range which can suppress the production of melatonin * a hormone responsible for your healthy sleep-wake cycles. In experimental scientific studies it has been shown that an average person reads on a tablet or smartphone for a few hours before bedtime could find sleep delayed by about an hour. See the references below. The Twilight app adjusts the screen of your device to the time of day. Filters the flow of blue light emitted by the phone or tablet after sunset and protects the eyes with a soft and pleasant red filter. The filter intensity is smoothly adjusted to the cycle of the sun based on local sunset and sunrise times.
Supported Android Devices : [4.0.3–4.0.4] Ice Cream Sandwich - [4.1–4.3.1] Jelly Bean - [4.4–4.4.4] KitKat - [5.0–5.0.2] Lollipop - [6.0 - 6.0.1] Marshmallow - [7.0 – 7.1.1] Nougat - [8.0-8.1] Oreo -  Pie