Well, that's like watching a new episode while playing games or surfing, and then having someone quiz you on what it was about. You're naturally not going to remember much.

That's why you have to pay attention. The only way you can multi-task and still have decent effects, is if you use an audio subliminal program, and even then, it has to be one that isn't using those aforementioned waves to make you relax.

But if you don't want to sit through the videos, try isochronic tones or hypnosis while falling asleep.