If you wake up at the end of the tape with the coming out instructions you weren't really asleep.
If you've set your intention before you put the tape on you'll have gotten it. The paraliminals are usually played out before your fully asleep.
If you don't mind disrupting your sleep to turn the tape of the repeating it won't hurt you, though personally I see it as pointless as the main impression of information goes in within the first 30 anyway. The information is better processed by the mind when you let it go and incubate during sleep.
Alex
