HARI SREENIVASAN: This is actually how 41-year-old Bob Troia sometimes sleeps – with this gadget on his head. So when he wakes up, he can see not only how long he slept … but also information so detailed he knows when – and how long – he was in…

HARI SREENIVASAN: This is actually how 41-year-old Bob Troia sometimes sleeps – with this gadget on his head. So when he wakes up, he can see not only how long he slept … but also information so detailed he knows when – and how long – he was in…
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