See your body in one of these two ways or do them both:

As they say in the movie Revolver by Guy Ritchie: 
"The greatest con that he ever pulled... was making you believe that he is you."
This is about the ego. And as the next line in the movie says, "Wherever you DON'T want to go, is where you will find him. What are you afraid of, Mr. Greene?" (https://clip.cafe/revolver-2005/the-greatest-con-he-ever-pulled-making-believe-he-you-s1/)

The "con" is not a traditional swindle, but a deep psychological manipulation where the main character's own mind is turned against him, endlessly lying to him about his Identity, confusing him. We don't want to go to the core of our sleep, to find the original error - because we are scared, scared to admit we are wrong and have been wrong about everything - who We are and what Life is. 

The core of sleep is the identification as a body. Bodies are not living, there is no one in them, and they are simply a distraction from our Reality. We think it's cold or unloving or simply undesired to not take oneself to be the body, to treat it as though it someone else's, like it has nothing to do with us. But, in Truth, the body has nothing to do with you.

Ramana Maharshi knew this so deeply he didn't even require anesthesia for serious surgery, just a topical anesthesia. He simply, truly, did NOT think of himself in bodily terms. The freedom of that is absolutely beyond words.

Go, then, to where the fear keeps you from going. No longer defend your false identity, rather, wake up!