A 20-minute nap refreshes. Just don't sleep in so long on Sunday morning that you find it hard to fall asleep Sunday night. Klaus Vedfelt/Getty Images hide caption
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After scientists screened over 8,000 genes in fruit flies, only one, which hadn't been described before, triggered sleepiness. Andrew Syred/Science Source hide caption
Teens' biological clock drives them to stay up late and sleep in. Most school start times don't accommodate that drive. Jasper Cole/Getty Images hide caption
Sleepless No More In Seattle — Later School Start Time Pays Off For Teens
Some apps, like CBT-I Coach, use proven scientific methods to help people manage their underlying sleep challenges. Mary Mathis/NPR hide caption
Think you can get away with fewer than eight hours of sleep per night? Neuroscientist Matthew Walker says, think again. Sophie Blackall/Getty Images/Ikon Images hide caption
It's one thing to track your heart rate, pulse or other movements with a smart watch or other consumer electronics, researchers say, but quite another to rely on the device to diagnose a disease. martin-dm/Getty Images hide caption
As people age they may forget more because their brain waves get out of sync, new research finds. PhotoAlto/Frederic Cirou/Getty Images hide caption
If you're regularly checking your phone at night in a dark room, you're probably tricking your body into thinking it's still daytime. Artur Debat/Moment Editorial/Getty Images hide caption
Think you can get away with fewer than eight hours of sleep per night? Neuroscientist Matthew Walker says — think again. Sophie Blackall/Getty Images/Ikon Images hide caption
Do we really need sleep? Mark Conlan/Getty Images/Ikon Images hide caption
Eleven Days Without Sleep: The Haunting Effects Of A Record-Breaking Stunt
Hannah Vanderkooy demonstrates the napping pod she uses at Las Cruces High School in Las Cruces, N.M. Joe Suarez for NPR hide caption
Escaping artificial light even for a winter weekend can reset sleep patterns for the better, researchers say. One good place to do it: Heliotrope Ridge near Mount Baker in Washington state. Christopher Kimmel/Aurora Open/Getty Images hide caption
Restoring sleep patterns could improve recovery after a serious brain injury. yipchoonwai/Getty Images hide caption
This happens, pediatricians acknowledge. So they're offering advice on how to reduce the risk of bed sharing with infants, which includes removing loose bedding that could lead to suffocation. PhotoAlto/Anne-Sophie Bost/Getty Images hide caption
One Silicon Valley startup that encouraged its employees to think about work 24/7 found they missed market signals, tanked deals and became too irritable to build crucial working relationships. Hill Street Studios/Blend Images/Getty Images hide caption
A new dad may look like he's holding it together, but odds are he's pretty sleep deprived. Thanasis Zovoilis/Flickr RF/Getty Images hide caption
Every parent's dream: a soundly sleeping child. iStockphoto hide caption
How do successful people's sleep patterns compare to average people? Seb Oliver/Getty Images/Cultura RF hide caption
Scenes like this, from Kolkata, are typical across some of India's biggest cities. Dibyangshu Sarkar /AFP/Getty Images hide caption
Babies have suffocated after being trapped in padded crib bumpers, according to the Consumer Product Safety Commission. iStockphoto hide caption