Yet sleep scientist Ying-Hui Fu at the University of California, San Francisco,says little is known about the basic need for sleep.

VOA: special.2009.08.26

The study found that more than one-third of the pictures in women's magazines showed babies in unsafe sleep positions.

VOA: special.2009.08.26

And they will study whether it is involving in controlling sleep quantity alone, or also what scientists call the "wakefulness-behavioral drive."

VOA: special.2009.08.26

And,if you wish someone good night, you might say, "sleep tight -- don't let the bed bugs bite."

VOA: special.2009.06.28

A new study found better results in four-year-olds who go to bed around the same time every night and sleep at least eleven hours.

VOA: special.2010.06.09

And then you do twenty-plus miles the next day,you sleep in a tent, you gotta wake up and you got to do it again.

VOA: special.2009.11.02

He died in his sleep in February,nineteen twenty-two, at the age of eighty-one.

VOA: special.2010.03.17

"They found that men can experience up to a three-fold increased risk of stroke, and that risk seemed to be well correlated with the severity of sleep apnea."

VOA: special.2011.05.04

Some patients are misdiagnosed as suffering from depression because many of the symptoms are the same - poor sleep patterns, depressed feelings and pain all over the body.

VOA: special.2011.07.26

But Armstrong and Aldrin asked to cancel the four-hour sleep period.

VOA: special.2009.07.15

You can sleep on it.If you still feel like going in the morning, - I'll take you to the airport.- No. I want to drive.

VOA: standard.other

The Bush administration strenuously defended so-called "enhanced interrogation techniques" like sleep deprivation to obtain information from detainees, and admitted to harsher treatment, like the simulated drowning technique called water boarding, that was used in the immediate aftermath of the September 11 terror attacks.

VOA: standard.2009.08.24