This was during the first deep sleep period, the researchers said.

研究人员说，这发生在第一次深度睡眠期间。

youdao

Try pressure ramp at beginning of sleep period.

尝试压力坡道开始睡眠期。

youdao

Virtually all souls will leave their bodies at some time during their sleep period.

实际上所有的灵魂都会在他们睡眠期间的某个时候离开他们的身体。

youdao

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

VOA: special.2009.07.15

When it was very, very hot in the middle of the day there was not point in being out, and you could actually use that period to get some sleep so you needed less sleep at night.

BBC: How we go to sleep

Vacations have been found to help us recharge -- we sleep better during them and for a period of time afterwards.

CNN: Take your vacation, or die?

"When people are entering a high-stress period, they don't sleep and don't exercise, but in fact, it should be just the opposite, " says Loehr.

FORBES: How To Run On Fumes