Are you having trouble falling asleep? Are your kids hyperactive when playing with the tablet before bed time? Are you using your smart phone or tablet in the late evening? Are you sensitive to light during migraine? Twilight may be a solution for you! Recent research suggests that exposure to blue light before sleep may distort your natural (circadian) rhythm and cause 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 460-480nm range which may suppress Melatonin production - a hormone responsible for your healthy sleep-wake cycles. 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. See references below.. The Twilight app makes your device screen adapt to the time of the day. It filters the flux of blue light emitted by 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. You can also use Twilight on your Wear OS device. Documentation http://twilight.urbandroid.org/doc/ Get more from Twilight 1) Bed reading: Twilight is more pleasant on the eyes for night reading. Especially as it is able to lower the screen backlight far below the ability of the backligt controls on your screen 2) AMOLED screens: We have tested Twilight on an AMOLED screen for 5 years without any sign of depletion or over-burning. If properly configured Twilight causes less light emission (by enabling dimming) with more equal light distribution (dark areas of the screen such as the status bar get tinted). This may in fact increase 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 household light from blue Accessibility Service In order to filter also your notifications and lock screen the app may ask for enabling Twilight Accessibility Service. The app uses this service only to better filter your screen and does not collect any personal information. Please read more about this at https://twilight.urbandroid.org/is-twilights-accessibility-service-a-thread-to-my-privacy/ Automation (Tasker or other) https://sites.google.com/site/twilight4android/automation 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, &amp; Co 2012 Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans Joshua J. Gooley, Kyle Chamberlain, Kurt A. Smith &amp; 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 pulses for delaying circadian phase in humans Claude Gronfier, Kenneth P. Wright, &amp; Co 2009 Intrinsic period and light intensity determine the phase relationship between melatonin and sleep in humans Kenneth P. Wright, Claude Gronfier &amp; Co 2009 The Impact of Sleep Timing and Bright Light Exposure on Attentional Impairment during Night Work Nayantara Santhi &amp; Co 2008 Short-Wavelength Light Sensitivity of Circadian, Pupillary, and Visual Awareness in Humans Lacking an Outer Retina Farhan H. Zaidi &amp; Co, 2007 High sensitivity of the human circadian melatonin rhythm to resetting by short wavelength light. Lockley SW &amp; Co. 2003

Urbandroid (Petr Nálevka)

Filters blue light from your screen, reduces eye strain and helps you sleep

Twilight: Blue light filter

Bowery Digital

Bend is the simple, affordable way to stretch every day.

Bend: Stretching & Flexibility

Plantake

Reduce Double chin & Face fat with Face Exercises, Face Yoga & Jawline Exercises

Jawline Exercises & Mewing

AMO Apps

Download MadMuscles to start your positive body transformation!

MadMuscles

VGFIT LLC

ProFit: Workout Planner

Senior Games

Boost your memory and cognitive skills with daily workouts.

Focus - Train your Brain

GymStreak Ltd

GymStreak: Workout & Nutrition

Finch Care Public Benefit Corporation

Mood journal, habits, self care tracker, self-love

Finch: Self Care Pet

HarmonyBit

28-day dance workout for weight loss. Enjoy dance fitness exercises at home

Dancebit: Weight Loss Dance

Voidpet

Virtual pets for mindfulness, mood tracking, and depression

Voidpet Garden: Mental Health

Challenge ABCD Team

Stretching before bed can help sleep better, after waking up to keep focused

Challenge: Workout & Relax

ENERJOY PTE. LTD.

Home workout & fitness. Lose weight and gain muscle with no equipment.

JustFit - Lazy Workout

The Pump

Fabrikod

Sleepy Baby - White Noise

Piladya Inc.

Personal Skincare & Face Massage Trainings with 150+ Original Content

Facebuilding - Face Yoga

PlaySide Studios Ltd

Dumb Ways to Sleep

Samsung Electronics Co.,  Ltd.

Lifestyle companion to track your fitness, weight, diet, food & sleep.

Samsung Health

Huawei Internet  Service

Huawei Health

Simple Design Ltd.

Lose weight fast with scientific workouts and a healthy diet in 30 days.

Lose Weight at Home in 30 Days

Shenzhen Well Health Management Technology Co, Ltd

fitpro

Leap Fitness Group

Weight loss tracker & app to Burn Belly Fat at home with workout in 30 days.

Lose Weight App for Men

Lose weight and Burn Belly Fat with at-home fitness app's workouts for women.

Lose Weight App for Women

Abs workout app - LOSE FAT & GET 6 PACK ABS with six pack workout at home.

Six Pack in 30 Days

Home workouts for fitness & fast bodybuilding at home - no equipment needed.

Twilight: Blue light filter 12.17

Releated Apps

Hot Health & Fitness Apps

Top Downloads in Health & Fitness

Latests Health & Fitness Apps