Is it healthy to sleep 10 to 14 hours per night? Dakota Johnson thinks so.
The "Fifty Shades of Grey" star, 34, shared in an interview with the Wall Street Journal, published Monday, that she's "not functional" if she gets less than 10 hours of sleep and "can easily go 14 hours" asleep in one night.
"I don’t have a regular (wake-up) time," she said. "It depends on what’s happening in my life. If I’m not working, if I have a day off on a Monday, then I will sleep as long as I can. Sleep is my number one priority in life."
Experts say the ideal amount of sleep varies depending on the individual; but, pushing 14 hours is likely overdoing it.
"There’s a range," explains Shelby Harris, a licensed clinical psychologist and the author of "The Women's Guide to Overcoming Insomnia: Get a Good Night's Sleep without Relying on Medication." "The majority of people fall somewhere between seven to nine hours of sleep a night ... but there are some people who are outliers, with some needing only six hours and others closer to 10."
What is sleep hygiene?Tips and changes you can make to get better quality sleep.
For middle-aged to olderpeople looking to get the best sleep possible, seven hours of consistent sleep may be the sweet spot, research suggests. The American Academy of Sleep Medicine advises adults get at least seven hours of sleep per night and teens get eight to 10.
More:Seven hours of consistent sleep may be best for middle-aged, older people, researchers say
Though many struggle to get enough sleep, it's also possible to get too much of it.
Harris says what's too much sleep varies for each individual, but more than 10 is likely overboard. This can result in feeling "sleep drunk," or especially groggy or foggy, in the morning, she says.
"Some people can feel fine if they’re naturally longer sleepers, but oftentimes people who are very long sleepers don’t usually feel like the sleep is refreshing," she says.
Oversleeping may also be a red flag of an underlying sleep disorder, such as hypersomnia or sleep apnea, says Sarah Silverman, a licensed psychologist and behavioral sleep medicine specialist.
"Sleep is just like shoe size," she says. "One size does not fit all, and some people are going to need more than eight. Some people are going to need less than eight. But really, I'd say that the sweet spot is going to be the number of hours of sleep that allows you to feel your best."
Joe Biden uses CPAP for sleep apnea:What to know about the common sleep disorder.
As people sleep, their brains work to consolidate memories and process things learned during the day, particularly during what's called deep sleep, Barbara Sahakian, a professor in the psychiatry department at the University of Cambridge, previously told USA TODAY.
But too little or too much sleep can create chronic stress. It can also cause changes in the hippocampus, a part of the brain vital to learning and memory, Sahakian said.
If you’re looking to improve your nighttime habits and feel well-rested, here are some tips to better your sleep hygiene:
Contributing: Saleen Martin, Daryl Austin and Clare Mulroy
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