Risk Factors

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Can Poor Sleep Cause Cancer?

If you have trouble sleeping, you may be at greater risk for certain cancers. Here's what we know about the connections between sleep and cancer risk.

By Martin Reed

Why Sleep Apnea Is Bad for Your Heart

Sleep apnea can raise the risk of heart attack, stroke, and irregular heart rhythms, such as atrial fibrillation. Here’s what to know.

By Sue Mittenthal

Does Daylight Saving Time Really Harm Your Sleep-Wake Cycle?

Daylight saving time (DST) is used in roughly 70 countries around the world. Moving the clocks forward by one hour is intended to better match daylight hours with human activity. Whether or not DST is a good idea is open for debate and generates a lo...

By Martin Reed

How Obesity Affects Asthma and Sleep Apnea

Excess weight makes breathing difficult for people with asthma or sleep apnea. But evidence suggests that losing weight can help ease breathing problems.

By Sue Mittenthal

Sleep Apnea: Causes and Symptoms

An estimated 12 million Americans have obstructive sleep apnea, which is characterized by repeated episodes of interrupted breathing during sleep. Yet 95 percent are undiagnosed and untreated.

By HealthAfter50

How to Deal With Nighttime Leg Cramps

Also known as a charley horse, it is associated with conditions such as dehydration, certain drugs, and chronic disease.

By Beth Kassanoff, M.D.

To Keep Your Mind Sharp, Don’t Skimp on Sleep

Increasing evidence points to the importance of good-quality sleep in preserving your memory and cognitive abilities.

By HealthAfter50

The Risks of Insufficient Sleep

Older adults are at higher risk for sleep deficiency—tending toward fewer sleeping hours and a different sleep-cycle pattern. Here’s what can happen when you don’t get enough.

By HealthAfter50

5 Sleep Stealers to Avoid

Try to stay away from the following stimulants, which can contribute to poor-quality sleep.

By Peter V. Rabins, M.D., M.P.H.