Developers created sleep masks that lull wearers to sleep using light technology, reports Interesting Engineering.

Sleep masks offer a solution to bright lights and helping tune out the world. However, those silken sleep masks often slide off one’s face during the night or do a poor job of blocking out the light.

Enter Philippe Genereux, a product developer, and his team at Sound Oasis. Genereux spent the last several years studying sleep and creating products to help people sleep better. They’ve developed several sleep masks that lull wearers to sleep using light technology.