Polish start-up IntelClinic won the Startup competition at LeWeb 2013 by showing off their NeuroOn brainwave-monitoring sleep mask. The idea is to allow you to switch from monophasic to polyphasic sleep. That means if it works, you can sleep less and more efficiently. Thus far they have collected 384 thousand dollars on Kickstarter.
You can also watch their presentation at the Startup competition here: