Study: Daytime naps keep your hearts healthy

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(CNN) -- No need to feel guilty about taking an afternoon nap. A little extra sleep could be the best medicine for your heart.

A new study in the journal 'Heart' found two naps a week can lower the risk of heart attack or stroke.

Scientists looked at 3,500 people for five years and discovered a nap or two, no matter how long or short, releases stress from a lack of sleep. The authors say more research needs to be done on this.

So how long is the ideal nap? The new study didn't answer that question. Most experts say a snooze is enough to increase alertness, performance, and mood.