This is ridiculous

I've been sleeping with CPAP since '97. I haven't slept a night without it since getting it. My CPAP machine has gone around the world with me. Now because of my upcoming surgery they want a new diagnostic test. Not a titration but a diagnositic. Sooooo they want me to sleep without it. I tried. Friday night i had the test. No sleep. ALL NIGHT LONG. not one minute of sleep. I have to reschedule to try again. It's torture. I don't know how they expect me to do this.