The only scene related to this, we commonly have seen in stories is Bhishma leaving his body, when he decides to leave. It was casual, when I saw in child hood. Though he has some super-power.

As understanding become better, about mortality nature of my existence. This capability of leaving your body at will, seems like an interesting capability to strive for. There are many people in our country’s history doing this.

Why is it interesting?
It looks far better than the common way people die these days. In hospital beds. In that noisy world of ICU.
If you are given a choice of environment to chose when you are about to leave your body, which one will you choose?
ICU device (sounds in background) environment or Om chanting (in background) environment?
I would choose the later one.

There are stories, when people become old, they just walk away into the jungle. This looks second best option.

I don’t know what is that, which is other than my sheets of body. I don’t know who’s will then it will be.

I am mortal.
I am alive.

Asathoma sargamaya
Thamsoma jyothirgamaya
Mruthoya amruthanga maya.

The last line means:
From death, lead me to immortality.

What is that immortality?

If you could leave your body at will, is that not immortality?