The personal tech columnist from The New York Times tracked his sleep for two weeks with an Apple Watch and some software. Here's why he concluded it was a pointless exercise.

For the last two weeks, I've added an extra step to my bedtime routine: strapping a computer around my wrist.

The new nightly move was prompted by a cascade of wearable gadgets from companies like Fitbit and Apple, which claim that their sensor-laden bracelets and watches can improve our lives by helping us detect health problems so that we can come up with solutions.

For many years, fitness gadgets

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How sleep cycles work

What to do?

Where that leaves us