To get a full answer you should really get in touch with the owner of the app, because it does really depend on how their track is constructed and how they intend it to work. I have one 50-minute sleep track which takes you down into delta ( and that is designed to just get you to sleep, so you just let play until the end. If you played that track on repeat it might make you jump and wake you up, as the track begins at a higher frequency. I have another 8-hour sleep track which is meant to be played all throughout the night ( So it does depend on the individual track you are using.
There are differences between high (over 18 hertz), mid (15 to 18 hertz), and low range beta states (12 to 15 hertz). Low beta states are more relaxed while still being focused, making this a good range for many daily work related tasks like balancing a checkbook, making a shopping list, or driving to a new place. However, people with attention deficit disorder lack the mental focus for doing these types of activities, and studies have found people with ADD are often low in this range of beta brainwaves.
Whatever your powerful mind believes to be true, it makes real in your experience. Your subconscious is a powerhouse of intelligence in action. It acts on your beliefs and perceptions. Theta binaural beats combined with subliminal messages reach deep into your subconscious mind to instill new ideas and beliefs. In a short time you’ll notice positive, even remarkable changes occurring in your life. The results are profound.
Then in my own research regarding my life-long hypertension and its resistance to medication, I became very concerned when I learned that 145/95 is the gateway to dementia. At that time my BP was consistently 145/95. Then, even worse, it started to become routinely 161/106. I was simply unwilling to take more medication with all its attendant side effects, so I started researching natural solutions. I became aware of a breathing apparatus which sold for $300 that would help me train myself to deep breathe, thereby reducing my blood pressure. $300 seemed like a lot, but not in the scheme of saving my life. I started thinking. I already knew how to breathe from my brief studies in Chi Gung. I simply needed something to help me focus my mind. I tried using the Chi Gung breathing while simply counting 200 breaths. It worked for a short while, but I quickly became far too bored, even though I knew it could be a lifesaving measure. I had been considering EquiSync for sometime, and realized it was much less expensive than a $300 breathing regulator, and that it might serve a dual purpose. So I purchased the entire suite.
When making an educated decision on what product is best for you, it is important to have a general understanding of how the technology works, and what the benefits are of visiting the specific brainwave states.  Please click the link to visit a more detailed article –  How Does Brainwave Entrainment  Work, and the benefits of Alpha, Theta, Delta, and Gamma brainwaves.

Now for a Delta Brainwave MP3 that is bound to take you to another world.. and most likely enter into a dream state – many people listening to this MP3 will fall asleep since it resembles entrainment sleep patterns. This session will slowly ramp down to the deepest Delta levels, and after it you are likely to feel that you have had a wonderful power nap. Headphones or speakers can be used with this MP3.
As soon as this session begins, the 10Hz frequency kicks in, helping to release your worries, brighten your mood, and encourage release of the happy hormone, serotonin. This is followed by progressive patterns of euphoria-inducing beta frequencies, each building on the last, helping you to get you energized and feeling great. The uplifting background also gives this session an added kick. An excellent way to start the day - but don’t use it too late, as it may disrupt your sleep patterns.