"This kind of sweating is cleansing, " an instructor says. "Your body starts to crave it. "

教练说：“这种出汗是一种排毒的方式， 你的身体开始需要练习这种动作了。”

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That's where we all cry from, " says Jane Daly, an actress and acting instructor.

我们哭都是因为这个，”女演员兼表演老师简-达利说。

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"If you have very severe sleep apnea, it's unlikely to miss it, but if you have mild apnea, it might, " says Douglas Kirsch, an instructor at Harvard Medical School.

WSJ: A Test for Sleep Apnea From Your Own Bedroom

"They've left the mirrors inside the bathrooms, so you can actually take a look at yourself while diving, " says Jason Shaddox, an instructor with local dive company Don Foster's.

CNN: A worthy wreck for divers: USS Kittiwake

"It was like, 'No one has ever entered this country before, let's go in and take some pictures, '" says study author Michael Grandner, an instructor in psychiatry and member of the Center for Sleep and Circadian Neurobiology at Penn.

CNN: Does your diet influence how well you sleep?