There are many fitness trackers that claim to help users log more sleep. Whether it’s through behavioral insights, data-driven trend analysis, or educational content, companies are eager to enter our bedrooms. The Muse S, now in its second generation, wants a place on your pillow. With built-in sensors, the headband leverages an electroencephalogram (EEG) to measure brain activity, heart rate, and breath, plus sleep stages and much more. Unfortunately, while the Muse S excels in real-time biometric feedback and meditation guidance, it left me with a lot less than 40 winks.

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