Pixabay Humans spend around one third of their lives sleeping.
Jean-Sebastien Evrard /AFP/Getty ImagesOur dependence on technology extends even to sleep ,apparently: One survey found that 71 percent of adults sleep with their phone nearby.
Dominique Faget /AFP/Getty ImagesIndulging in an afternoon nap could make you more productive, and improve your memory and creativity, according to Harvard Medical School. They recommend keeping naps short: 20-30 minutes at most.
Hero Images/Getty Images Twenty-three percent of married couples sleep in separate beds in order to get more sleep. The National Sleep Foundation found that on average, people in relationships will lose an average of 49 minutes of sleep per night because of their partner's sleep problems.
Paul Bradbury/Getty ImagesA recent study found that many people over 55 still dream in monochrome because they were brought up on black and white television. People under 25 almost universally dream in color.
AFP/AFP/Getty ImagesThe way you sleep can benefit your health: Sleeping on your left side eases the pain of heart burn, while lying face down can aid digestion during the night.
Pixabay The falling sensation you might get as you drift off to sleep has a name: Hypnic jerks, or sleep starts.
Pedro Armestre/AFP/Getty ImagesA whopping 40 percent of American adults are sleep-deprived, or get less than seven hours of sleep per night.
Sean Gallup/Getty ImagesThe National Sleep Foundation reports that only 15 percent of teens get the recommended 8.5 hours of sleep per night, and a study by University of Utah Health Care found that 90 percent of American high school students are chronically sleep deprived.
Frederic J. Brown/AFP/Getty ImagesThe Centers for Disease Control and Prevention reports that single moms are the most sleep-deprived population in the U.S.: 44 percent get less than seven hours of sleep per night.
Elva Etienne/Getty Images A UC Irvine study found that toddlers who regularly co-sleep with their parents grow up to be more independent. That means they're more likely to be self-reliant, and have an easier time making friends.
Milan Markovic/Getty ImagesCar accidents increase by 17 percent on the Monday after the switch to daylight saving time — when people lose an hour of sleep. Researchers say that even the loss of an hour of sleep can cause a dangerous disruption in sleep cycles.
Jin Chu Ferrer/Getty ImagesForty-two percent of all dog owners allow their pets to sleep in the bed with them at night. Dr. Russell Rosenburg, Chairman of the Board of the National Sleep Foundation, told the Huffington Post that though pets are known to reduce stress levels, "sleeping with a pet can be bad for you" because of their disruptive behavior during the night.
Paul Bradbury/Getty Images There's a real term for struggling to re-adjust to your work week after several days off: It's called social jet lag, and according to researchers at the Institute of Medical Psychology, it increases your risk of obesity.
Tara Moore/Getty Images That "natural alarm clock" that enables some people to wake right around when they need to is caused by a burst of the stress hormone called adrenocorticotropin. This natural wake up call is the result of an unconscious anticipation of the stress you'll face once you're awake.
C. Beth Ellis /EyeEm/Getty ImagesVarious studies have shown that getting a good night's sleep increases stamina in athletes; reduces inflammation (which can lead to heart attacks); makes it easier to study, and lowers stress levels.
Ghislain & Marie David de Lossy/Getty ImagesLack of sleep puts your mental health at serious risk. Mark Rosekind of the National Transportation Safety Board told The Washington Post that, "Your decision-making, reaction time, situational awareness, memory, and communication...go down by 20 to 50 percent" when you lose sleep.
Gonzalo Arroyo/Getty ImagesTwenty-seven percent of Americans report that they've driven to work drowsy, which can be fatal. The AAA Foundation for Traffic Safety found that people who sleep six to seven hours a night are twice as likely to be involved in a car crash as those who sleep eight hours.
Tim Boyle/Getty ImagesA book entitled The Secret Life Of Sleep claims that in 2005, U.S. doctors wrote six million prescriptions for Ambien, a medication prescribed to alleviate insomnia.
The drug is known as a "sedative-hypnotic" and users can become dependent on it to fall asleep in as soon as two weeks. Ambien addiction can lead to severe withdrawal symptoms like confusion, nausea, and even worse insomnia than before the drug was prescribed.
Lynn Koenig/Getty ImagesSleep paralysis is the temporary inability to move or speak as you're either waking up or falling asleep -- and the condition usually involves terrifying hallucinations.
The condition affects less than eight percent of Americans, but those who suffer from it report feeling as though a ghost-like presence is sitting on their chest, and some even claim to see shadowing figures moving around the room.
Uriel Sinai/Getty ImagesTiredness peaks twice a day, first at 2 a.m. and again at 2 p.m., which accounts for your daily post-lunch crash.
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