Activity records from more than 100,000 people have revealed 16 categories of slumberer — and could offer hints about how sleep disorders arise. Massive sleep database also uncovers four new types of insomnia. | Poal: Say what you want.

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Activity records from more than 100,000 people have revealed 16 categories of slumberer — and could offer hints about how sleep disorders arise. Massive sleep database also uncovers four new types of insomnia. (www.pnas.org)

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