Shape magazine offers tips to use technology at night and still get a good night’s sleep.

Consider a Kindle
In the research above, the study authors investigated multiple tablets and e-readers, including the iPad, iPhone, Nook Color, Kindle, and Kindle Fire. Most emitted similar amounts of light—except the Kindle e-reader. It only reflects ambient light, which isn’t as harmful to sleep as the emitted light from the other devices. (Electronics aren’t the only sleep sappers. Here are several other Reasons You Can’t Sleep.)