We’re a few days into CES now, and amid the demos, launches, meeting, greeting, keynotes and all the walking, there’s one thing on a lot of people’s minds: sleep. So, Marketplace’s Lily Jamali stopped by the National Sleep Foundation’s booth to meet some folks there thinking about sleep. She spoke with Biquan Luo, co-founder and CEO of Lumos Tech, whose company makes what looks like a regular sleep mask, but has embedded LED lights. It’s designed to help recalibrate a user’s sleep schedule.