We list the most incredible medical breakthroughs made this year, and each of them is a gift that will save millions of lives.

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1. Another step closer to an insomnia cure
1. Another step closer to an insomnia cure

In America, about one in three adults struggles to get enough sleep, which is linked to overeating, obesity, diabetes, heart disease, and problems on the job.

Our sleep cycles are tied to an internal body clock (circadian rhythm)—and now scientists have discovered not only a gene that controls our normal daily biological rhythm, but also the mechanism by which that gene operates.

Because of the importance of sleep to health and well-being, these discoveries are expected to have vast implications for human health and well-being.

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