Some of it maybe, but if you don't wake up when the file instructs you to, then you were probably were not really hearing the file. Sleeping is a deeper state than trancing. WOH
I sleep tranced to files for years and it works, but you have to keep doing it for a long time. Expect results to take over months instead of weeks. However, after years of sleeping to a file that file will be REALLY deep in your subconscious in a way that conscious listening can't get to.