13 health rules you can break

POSTED: 12:32 PM PST Jan 27, 2013    UPDATED: 11:00 PM PDT May 18, 2014 

Some health rules are followed religiously, but really have no medical or scientific foundation. Here are 13 popular rules that aren't as hard-and-fast as you might think.

Sleep - Generic
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You need eight hours of sleep each night. Not everyone needs eight hours of sleep a night. Some people run fine on six while others can barely function without nine. In fact, there’s historical evidence that humans used to sleep in intervals: two hours at dusk, a two-hour waking period, and then a second sleep. The amount of sleep you need varies on a variety of factors, including illness, stress, physical activity, and more. As a good rule, if you awake feeling tired, you probably need more or better sleep.

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