If you have trouble in sleeping after long time watching phone screen thats due to blue light. Visible light contains a range of wavelengths and energy. Blue light is the part of the visible light spectrum that contains the highest energy. Because of its high energy, blue light has more potential to cause harm to the eye than other visible light. A convenient way to reduce your blue light exposure is to apply a blue light filter to the screens of your digital devices using Blue Light Filter. These filters are available for smartphones, tablets of all sizes.
Blue Light Filter applies a shade that acts as dimmer to ensure your eyes don't hurt and your screen can be more darker than it could by your android system as itself. Colors filter changes the shade color but it keeps your screen darker too. Screen filter is a great way to use for web browsing, reading or gaming at night.
IMPORTANT:
If your screen gets too dark and you can't see anything please reboot your device or go to a dark place where you can disable screen filter.
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Enjoy!