For years, people have relied on harsh drugs and irritating alarms to control when they sleep and when they wake. Now, the Nansense wristwatch offers an all-natural way to determine your daily rhythms. Using painless nanoscale needles, Nansense monitors and regulates your levels of cortisol and melatonin, the hormones that govern circadian cycles. Have a deadline to meet? Spin the dial for a gentle way to stay awake. Drowsy from jet lag? Nansense will put you on local time in no time. From the NANO Supermarket product collection. Designers: Joshua Brevoort, Lisa Chun, Eric Baldwin, Ian Campbell. Enabling technology: Nano sensors, metabolic engineering. Feasibility: Medium.