That's interesting that you can listen to something for insomnia. I typically only have insomnia when I'm stressed about something, and my mind wants to keep trying to fix that stress (repress it by solving what's causing it), so it won't stop and just relax so it can rest/sleep. It's strictly an emotional thing. It used to happen to me, but it's almost never happens now. It's important for the brain to sleep. Throughout the day, our brain produces waste. Not exactly toxins, but definitely stuff you want to sit there in the brain, because it bogs it down, causing it not to function well. Sleep is when the brain gets rid of all of that waste so it can operate properly the next day.
When it does, I'll endure it at first, and just relax my body as best I can, one part at a time--left foot, left leg, right foot, right leg, pelvis area, stomach, chest, left arm, left hand, right arm right hand, shoulders, neck, jaw, face, temples, top of head. That's reverse order, but you can do it either way. Consciously relaxing the body does a couple of things--it directs the mind to an activity, and it consciously causes the body to slow down and let go of its tension. When I do Kriya yoga (meditation), I have to go through that process of relaxing every part of my body. You get very quick at it eventually. Even when I'm not having insomnia problems, I go ahead and relax all of my muscles at night when I'm going to sleep. I fall asleep much more quickly.
With TPP, the intent and hope is that the emotion causing the mind to go nutty trying to fix the problem will surface so we can consciously feel it, accept it unconditionally without trying to get rid of it, and then let it integrate naturally. Anytime I have insomnia, I look at it as a great opportunity to feel some part of my heart that needs to be loved unconditionally so it will integrate.
Oh, and if I know I have a lot of work to do the next day, and falling sleep would be dangerous (I drive vehicles when I work), I take a Benadryl or two before bed. That relaxes me, and when I sleep, it drops me into a deeper, more restful sleep. That way, I'm better prepared to do my job the next day. But if I'm too stressed out, even the Benadryl won't put me to sleep. My mind will have to get to the point where my body's exhausted and can't help but fall asleep. That doesn't really happen anymore since I've done TPP. And I've also learned to lay in bed the entire time, from around 10pm to 6am, no matter what time I wake up, and leave my eyes closed, and do my best to think of nothing. This allows my body and my eyes to get sufficient rest, so that I'll be more likely to make it through the next day without getting tired (or without getting too tired). Oh, and Z-Quil is the same thing as Benadryl, but at least twice as expensive. So I buy the little 100 count Walmart brand of Benadryl (It's the Equate brand in a pink and white little bottle). It's crazy cheap and lasts forever if you rarely use it. Two of those is the same as two Benadryl. I try not to take it unless absolutely necessary for my job the next day. But usually, I'll tough it out, because I can always pull over while I'm driving and rest my eyes for 15 minutes, which fixes the heavy eyes. I drove from 6am to 10:52pm yesterday without once getting sleepy or heavy eyed, but then again, I'm sleeping decently right now, for the most part, too. I did take a Benadryl the night before, though, just to make sure I would be able to make it for all of those hours of driving.
That's just how I deal with it. Everyone has to figure out what works for them personally.