How Much Sleep Do You Really Need?

How Much Sleep Do You Really Need?

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Celebrity hair stylist Kristan Serafino’s jam-packed schedule forced her to put a good night’s sleep on the backburner. Serafino—who has styled Matthew Mc Conaughey, Meg Ryan—would nab only four hours of shut-eye each night, and lean on props at photo shoots to keep herself from collapsing. “Chugging coffee was a big help,” she recalls.

Her wake-up call came when she conked out at the airport gate while waiting for—and nearly missing—her flight to a photo shoot. After that, Serafino decided to make sleep a priority, and now hits the sheets earlier to log six to eight hours of z’s each night. “Now that I have better control of my sleep patterns, I wake up in the mornings with more energy, and I am down to one cup of coffee a day,” she says.What Serafino doesn’t realize is that by increasing her nightly slumber from a paltry four hours of sleep to at least six, she may have also prolonged her life. That’s because not getting enough shut-eye can actually shorten your life span. Yep, you heard that right.

The health consequences of too little sleep

Even though sleep researchers are still trying to unravel why, exactly, we sleep—it seems to have restorative, healing powers and helps us sort and file away our daily memories—there’s no doubt that we can’t live without it.“You can live longer without food and water than you can without sleep,” says Lisa Shives, M.D., medical director of Northshore Sleep Medicine in Evanston, Illinois.

STUDY: Sleep Boosts Beauty

Consistently not getting enough sleep doesn’t just leave you a dazed, moody and forgetful former version of yourself, chronic sleep deprivation can also put you a risk for a whole host of health problems ranging from diabetes to hypertension and obesity—all of which can affect longevity, according to Sonia Ancoli-Israel, Ph.D., director of the Gillin Sleep and Chronomedicine Research Center and professor of psychiatry at the University of California, San Diego.

Too much sleep hurts health, too

Unlike Serafino who trudged through the day on little sleep, beauty editor Courtney Dunlop was convinced she couldn’t function without nine hours of slumber each night. “I used to say that I prefer 10 hours of sleep, but that I try for at least nine,” recalls Dunlop. “The thing is, I was always tired. All day long—tired.”Dunlop’s tipping point came when she got a new job that required her to show up at the office by 9 a.m. rather than the 10 a.m. start time she was used to at her previous job. “It was unrealistic to go to bed earlier than I already was, so I started getting seven-and-a-half hours of sleep at night.”Surprisingly, Dunlop felt more alert, with enough extra energy to work out in the evenings. “I used to oversleep almost every day,” she says. “I’m not saying I suddenly jump out of bed all cheery now, but it’s not as hard anymore.”

MORE: The Beauty Benefits of Sleep

Dunlop did her energy, and her health, a favor by scaling down her sleep schedule. New sleep research shows there is a U-shaped relationship between slumber and longevity, meaning that getting too little—or too much—sleep will raise your mortality rate. Numerous studies have come to the same conclusion: People who self-reported sleeping more than seven-and-a-half hours a night or less than six to six-and-a-half hours a night had an increased risk of death.While not logging enough snooze time has a clear and direct affect on your health, “getting too much sleep—a condition called hypersomnia—isn’t a problem on its own per se,” says Dr. Shives. It’s the fact that oversleeping can be a red flag for an underlying health condition, such as obstructive sleep apnea—a dangerous disorder that causes people to stop breathing momentarily during sleep—and depression.

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Rachel Grumman Bender
Rachel Grumman Bender is an award-winning freelance health and beauty writer and editor. She writes regularly for The New York Times and has written for Women's Health, Yahoo Health, Everyday Health, the New York Post, Cosmopolitan, and many more publications. Rachel has held Health Editor positions at YouBeauty.com and Cosmopolitan magazine. She earned her bachelor’s degree in journalism at Boston University and her master’s degree in journalism at New York University. She lives in northern California with her husband and her twins.