Do you have control over jarring ads?  At about 50 mins., asleep and, "Hey! I wanti show you my free webinar...!"  Perfect.
Sadly, I do not! YouTube wants people to watch ads every 5 minutes. Thankfully that doesn't happen here but a (very) small percentage do seem to get mid-roll ads. You can download this track from my site instead: http://bit.ly/bestbinaural
Doc Will