will my surgery be postponed because of insufficient use of a recommended bi-pap ?

i have my 3rd (and hopefully final) sleep study scheduled next weds. night, my surgery is Fri. morning.They had to schedule this last study because i only slept 45 mins last time.Has anyone had their surgery cancelled because they were not on the machine long enough at home? with only 1 night at home after the study and before surgery, i'm concerned about this. I also had to do a blood gas test yesterday. Should i worry ? Thanks for any input........

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