First, there may be a brief cessation or reduction of breathing when falling asleep as the sleeper waxes and wanes between sleep and wakefulness and their differing control mechanisms.

首先，睡眠者在半梦半醒及不同调节机制之间转换时进入睡眠状态，呼吸可能短暂地停止或减少。

youdao

In addition, another 12 people were placed on a longer, 24-hour program with either interference and sleep or wakefulness.

此外，还有12个人进行一个更长的项目，他们或干扰并睡觉或不睡觉。

youdao

Other times, I’d hear the cry just as I crossed over into wakefulness or departed from sleep, and on those mornings I rose with the feeling of something wound around my neck.

还有些时候，我在失眠或是醒来的时候也能听到那叫声，清晨，我在起来的时候总觉得脖子上围了什么东西。

youdao

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