90 percent of U.S. adults have this syndrome — but most have never heard of it

 (iStock)

New guidelines may soon make the disorder known as CKM syndrome a common diagnosis.

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Japan’s wild new sleep gadgets aim to help a nation running on empty

 (Kentaro Takahashi for The Post)

From puffer jackets designed for power naps to homes that auto-adjust lighting and temperature, better sleep in Japan is a booming market.

By Michelle Lee and Chie Tanaka

I’m a sleep doctor. These are the signs you have a real sleep problem.

Yes, wearing socks to bed may help you sleep better