Track your every calorie and footstep

With a bit of hardware, your iPhone can become your personal sleep coach.
Users wear Lark's lightweight wristband throughout the night. It gathers intel on how long it takes you to fall asleep, how many times you wake up, and other details about how soundly you're sleeping. The data is sent to Lark's iPhone app for your perusal. The wristband also serves as a silent alarm clock.
To develop the technology behind the service, Lark founder Julia Hu worked with a Harvard sleep expert and a professional sleep coach who helps NBA and Olympic athletes optimize their rest. The wristband and sleep tracker sells for $130. An extra $60 gets you the Lark Pro package, which includes a "Sleep Coach" app.

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