If you've ever experienced the frustration of being torn between wanting to read more from your e-book and putting your device down because the light hurts your eyes for being too bright or insufficient, worry no more because Google released a new update to the Google Play Books app on Dec. 15 that will make e-book reading easier on your eyes.

With the night light funtion, there's no more need to squint from the bright light or keep on readjusting the brightness of your device's screen because the Google Play Books update 3.7.45 will automatically do the adjusting for you.

Google Play Books Senior Product Manager Greg Hartrell posted the announcement on the official Google blog on Dec. 15 and said that the update is rolling out for both Android and iOS users.

"Night Light automatically adapts to the amount of natural sunlight outside based on the time of day, giving you just the right temperature and brightness," Hartrell wrote.

It all has to do with filtering out the blue light emitted by electronic devices, which studies have proven to be the major reason why people have a more difficult time getting a good night's rest. When a user turns night light on, the app will filter the blue light gradually and replace it with the warmer amber tone. Then it's all automatic from there.

Hartrell also explained in the blog that the night light update for Google Play Books was conceived after seeing that reading activity around the world peaks from 8:00 P.M. to 10:00 P.M., which is usually just before bedtime. Since studies have shown that bright light, specifically blue light, affects the production of melatonin, the chemical responsible for signaling that it's time to rest, the company decided to make changes in its e-reader to enable users to enjoy reading and still get a restful sleep.