CNN Vital Signs with Dr. Sanjay Gupta April 25, 2015 19:35:00
>> you're going to go ahead and place this on your face. you've done this before. >> during his first sleep study, glenn wore a mask connected to a machine called a c-pap that monitored his breathing. when you stopped breathing, the machine sent pressurized oxygen through his airways, forcing them open. >> when you woke up in the morning, you felt -- >> i felt like a new man. >> what glenn experienced was a night of shut-eye that finally included all stages of a sleep cycle. the last stage is called rem, rem, short for rapid eye movements. this is the dream stage of the sleep cycle, and dr. de...
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