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Sleep

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What Is the Best Alarm Clock?

Newfangled alarm clocks may use REM-tracking sleep monitors and sunrise-mimicking lights, but the best wake-up technology was perfected 30 years ago.

By Lauren Schwartzberg

Everything You Need to Know About Buying a Mattress

Open-cell foam, Hyper-Elastic Polymers, 100-day return policies: sorting through the sleep world’s latest layers of innovation — and confusion.

By Jada Yuan, Lauren Schwartzberg and David Marchese