Another product that's gotten a big response is Chrona, created by Ultradia. It's a memory-foam insert that you slip inside your pillowcase, where it… - Arianna Huffington

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Another product that's gotten a big response is Chrona, created by Ultradia. It's a memory-foam insert that you slip inside your pillowcase, where it tracks your sleep based on the movements of your head and torso. Ultradia cofounder Ben Bronsther says his goal is to build Chrona into a home polysomnography, or PSG, device, which can act as a full-fledged home sleep lab for users, with no uncomfortable wires and no overnight stays in a lab required.