A to Z Health Guide 2007

The scientific bulletin of the year may be the stem-cell breakthrough. But 2007 provided a whole alphabet of big medical news. TIME's A-to-Z guide reviews them

By Coco Masters, Alice Park, Carolyn Sayre, Tiffany Sharples, Alexandra Silver and Kate Stinchfield

TOM MERTON / GETTY
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Snoozing cats may lose an awful lot of their day to sack time, but they may be on to something. A Greek study published in the Archives of Internal Medicine this year showed that people who nap at least three times a week for at least 30 minutes are 37% less likely to die from heart disease. Another study, published in the online edition of the Journal of Applied Physiology, provided a possible reason: blood pressure eases in the time just before sleep. The coronary value of a siesta, however, is still questionable. Researchers have yet to explore whether blood pressure rises upon waking from a nap. Snoozing certainly isn't a guarantee against getting heart disease, but the studies do provide an excuse for half an hour of downtime.

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