After many years of study, no one knows how much sleep we need to function normally.
The important thing, says Scharf, is that people who need sleep aids can take them.
Don't start reading this at bedtime if you need sleep before going to work.
Yes, the Hue can actually help you stay awake when you want to, and go to sleep when you need to.
FORBES: The Best Product of 2012: The Philips Hue LED Lighting System
It's an enzyme called tryptophan which helps you manufacture enough serotonin so that you can sleep when you need to and it helps keep you alert and able to concentrate.
Lanier is studying fiction writing in a masters' program, and said she plans to record her campfire conversations with her traveling buddy, who plays in a band called I Need Sleep and will also offer some free musical entertainment.
Having said that, we do know sleep is key: Teens need an average of one or two hours more sleep than their 9- and 10-year-old siblings, yet studies show most teens gets a few hours less.
Mr. Ellis says he couldn't understand how anyone could need more sleep than he did.
Don't assume they will suddenly get more energy or need less sleep when they're on vacation.
Women may need more sleep than men, Prof Horne says, due to the structure of their brains.
BBC: NEWS | UK | Magazine | Why should we have eight hours' sleep?
"You need enough sleep to wake up and not feel tired and fatigued the next morning, " he says.
Those who exercise need less sleep--and they sleep more deeply when they do.
Do your physical needs change during high versus low periods, such as your need for sleep, food or sex?
"I wanted to get it done because I need to sleep, " he said.
America is the first society in the world that has tried to organise itself on the assumption that human beings do not need to sleep.
While this may be partially due to injury, illness, or other complications of aging, some research suggests that older adults need less sleep in general.
So unless you are lucky enough to not need the sleep and feel well without it, I would try to exercise in a way that does not cut into your rest.
So you need to sleep to maintain your sanity, your health and to perform at your best, and the following practices have worked for me when it comes to getting some much-needed shut-eye.
FORBES: Sleepless In The Big City: Why Leaders Are So Tired (and what can they do about it)
And that fact that 73% of the world uses alarm clocks, says Dr Idzikowski, confirms the need for more sleep.
On past experience, America's rich need not lose sleep over that.
ECONOMIST: How to raise the highest rates without doing too much damage
"We aren't sure why activity primes your body for sleep so well, but it's likely a combination of factors, including lowering your core body temperature, increasing the sleep-promoting hormone melatonin and supporting a biological need to restore energy levels and repair cells and tissues when you sleep, " Cardinal says.
Sleep studies don't usually need to be done on children who have trouble falling asleep or staying asleep.
Texting is interrupting their sleep at an age when they need it most, and they could be more vulnerable to thier unintentional oversharing being posted for others to see.
WSJ: It Takes Brass to Play the Wagner Tuba | By Barbara Jepson | The Ring of the Nibelung
If you have been feeling down for about a month or are experiencing symptoms such as insomnia or the need for much more sleep and a loss or increase in appetite, you might be suffering from depression and should seek the help of a professional, suggests Grayson.
About 45% of adolescents ages 11 to 17 get less than eight hours of sleep a night, even though teenagers need between nine and 10 hours.
WSJ: How Much Sleep Do Children and Teenagers Need? Grown-Up Problems Start at Bedtime
According to the National Institutes of Health, most adults need seven to eight hours of sleep a night.
应用推荐