Beyond simply adding some variety to your daily bar graphs, monitoring the depth of your slumber is also key to the success of the Smart Alarm.

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Jawbone's also augmented the array of alarm options, adding Power Nap and Idle Alarm, which function much as they sound, alongside the more standard Smart Alarm.

ENGADGET: Jawbone starts over, announces a redesigned version of its Up lifestyle-tracking wristband

The extension of the Smart Alarm is Power Nap.

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One morning I forgot to take it out of sleep mode and the Smart Alarm went off 15 minutes after I got out of bed and was making a pot of coffee.

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If you'll remember, soon after its launch, owners of that tracking band began reporting issues with defective units: suddenly non-functioning vibration motors (essential for Smart Alarm) or, worse, an inability to sync data.

ENGADGET: Jawbone starts over, announces a redesigned version of its Up lifestyle-tracking wristband

Instead of making a loud noise at a predetermined time, the Smart Alarm gently vibrates when you're in a light sleep, somewhere around the time you'd like to wake up (up to 30 minutes before you've actually set it).

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Every hour on the hour (set your watch or smart phone alarm) I ask myself the following question.

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