To overcome insomnia and to be able to rest 4 hours and feel like you’ve slept 8 hours, listen to the Brother Charles Synchronicity audio with your stereo headphones just as you are falling asleep.
Alpha sound made popular by Jose Silva around the 40s. Alpha is designed to help you focus on what you want more of in your life. I listen to the Alph first thing in the morning.
The Theta in particular is a great way to bring you to a deep state of restful sleep: