Does one's sleep apnea get worse if you're extremely tired?

I am scheduled for a sleep study, (daytime fatigue, snoring, dry mouth, headaches in the morning) and my insurance company apparently requires a certain "level" of severity for sleep apnea. I'm wondering, is one's sleep anea ever worse when one is extremely tired? In battling my insurance, I'm to the point where I might just stay up the night before to insure that I'll be REALLLY fatigued when I go in for my sleep study, if this will help me have a "severe" enough level of sleep apnea? Any comments would be appreciated. Thanks!!

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