“Blue Shade” uses specialized filters to limit Amazon Fire Tablet users’ exposure to blue light at night, reports GeekWire.

Amazon notes that recent studies by the Harvard Health Publication show how nighttime exposure to blue light from electronic screens can reduce the amount of melatonin our bodies produce, which can affect how long it takes to fall asleep, as well as the quality of REM sleep. The new feature also extends battery life by up to 25 percent.