I didn't have to work today so I put this on last night and let it rip. I really love theta waves because those always seem to hypnotize me to sleep. I slept for 5 1/2 hours and made it to what looks like 4/5 the way into the deep part of the last Delta cycle. I do feel refreshed but also kinda groggy bc my body has become accustomed to waking up at 4am every single day including weekends for the past ten years, so it may not necessarily be a bad thing. 
 I usually listen to a mix of binaural beat style tunes, the musical mixes you find on YouTube, the short 90 min renditions of a sleep cycle, and hypnotic straight theta or Delta wave tones.  I think regardless of what's coming in the ear the brain is going to start or stop a cycle when it pleases 🤷🏻‍♀️. Perhaps the brain will be trained to follow a binaural beat after listening to it repeaditly though, and if it makes the person's natural Delta phase last longer that maybe that's a good thing? Not sure. More research needed I guess. Anyways great video!
For sure. Just need some EEGs and a few hundred volunteers for the answer! :)
Michelle Myers