Noah Zandan shows off his Zeo sleep-tracking headband. His other self-tracking devices are on his wrists. Noah and his father, Peter, are both part of the growing "Quantified Self" movement. Elise Hu/NPR hide caption

toggle caption Elise Hu/NPR

All Tech Considered

Self-Tracking Apps To Help You 'Quantify' Yourself

Technology is making it easier than ever to track everything from your sleep cycles to the food you eat — and even your amino acid levels.

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