The Re-Timer is a pair of glasses that uses light therapy to regulate and reset a user’s sleep rhythms, and tell the body when to sleep and wake up, as reported by the Wall Street Daily.

Worn like regular glasses, Re-Timer uses an ultra-violet-free green light to mimic the effects of sunlight.

The designers say that after a decade of research, the green, blue/green, and blue areas of the light spectrum are “most effective at changing the body clock timing.”

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