why,when we do not sleep, we do not function well. We just do not know much about sleep at all."

VOA: special.2009.08.26

But here is something that scientists now know: A team led by Professor Fu has reported the first genetic link to how much sleep we need.

VOA: special.2009.08.26

Then we rode on into the night, looking for a place to sleep.

VOA: special.2010.01.30

"I usually sleep in because we stay up late on New Year's Eve.

VOA: special.2009.12.28

He allowed us to stay here and provided security for us so that we can sleep in peace without worry."

VOA: standard.2010.06.01