Suddenly I was in deep,dreamless, peaceful sleep.

VOA: special.2010.07.10

But think of the various periods during the night in which you are in a deep, deep dreamless sleep.

但请设想你处在这样的夜晚,你处于熟睡，安枕无梦。

耶鲁公开课 - 死亡课程节选

It's not that He simply wakes up those in a deep, deep sleep.

他并不只是将他们从沉睡中唤醒。

耶鲁公开课 - 死亡课程节选

Total deep sleep decreases from nearly 20% of a normal nights sleep for those under 25 to less than 5% for those over 35.

BBC: Sleep linked to ageing

That part of the brain is essential for entering deep sleep, but with age the region degrades.

BBC: Boosting sleep 'may slow memory rot'

Early one Sunday morning, the shrill reverberating sound of my home phone woke me from a deep sleep.

FORBES: A Rolls Royce Drove My Overnight Success