Blue-light exposure has been identified as causing sleep depredation.
Reducing blue-light exposure protects your eyes and provides the best nighttime reading experience. Some devices have an automatic setting that mimics the sun’s natural progression, emitting the optimal brightness and hue based on the time of day. These include:
- Kobo Aura ONE and Kobo Aura H2O edition 2, Kobo calls this a ComfortLight Pro.
- Kobo Clara, Kobo Forma - automatic
- Tolino Vision 4HD
- newer models of the Apple iPad
- Android beginning in 9.0
- Blue Shade is an exclusive Fire OS “Bellini” feature that works behind the scenes to automatically adjust and optimize the backlight for a more comfortable nighttime reading experience.
- Nook GlowLight 3 has a special night mode selected by the user.
- NOOK GlowLight Plus has night mode and can be set up to work automatically.
- BOYUE Likebook Mimas has this feature in a 10.3" E Ink device.
- MooInk and MooInk Plus, 6" and 7.8"
There are also third-party programs for Android and desktop OSes that will filter blue light automatically based on time-of-day location settings. These include Twilight, Redshift, and f.lux. All newer Apple devices can also do this automatically. This feature began with iOS 9.3.
 more hardware
- DASUNG is concerned with this issue.