Can the Manta Sound Sleep Mask improve your rest? I tested it out. With all of the high tech sleep products out there, like white noise machines and headphones , it can be difficult to find the products that actually give you a deep sleep. As a light sleeper, I wanted to try out the Manta Sound Sleep Mask to see if the Bluetooth sleep mask is worth the almost $150 price tag. Watch me test the Manta Sound Sleep Mask with an afternoon nap. You may have come across Manta Sleep on Instagram or...