Neurotech startup Elemind invented a headband that sends sends sound through your skull to move your brainwaves from awake to asleep. The Post tested it out to see if it really works.

The headband, from a company called Elemind, is sleek and comfortable. At $349 (plus an optional subscription fee for access to your sleep data), it's also really pricey. It packs in a lot of tech ...

AI tech startup, Prophetic, created a headband that can cause the wearer to have lucid dreams, that would theoretically give them control over their waking lives. The device will cost $2,000.