The process of dying

A heavily laden cart creaks as it moves along the road; in the same way the body groans under the burden of life as death approaches. When the body grows weak through old age or illness, the soul loosens itself from the body, as a mango or a fig loosens itself from its stalk; and thus it prepares to begin another life.
The soul gathers the powers of life to itself, and descends with them into the heart.
As life leaves the
1. Eye, and returns to its source within the soul, the eye no longer sees.
2. Nose, and returns to its source within the soul, the nose no longer smells.
3. Tongue, and returns to its source within the soul, the tongue no longer tastes.
4. Mouth, and returns to its source within the soul, the mouth no longer speaks.
5. Ear, and returns to its source within the soul, the ear no longer hears.
6. Mind, and returns to its source within the soul, the mind no longer thinks.
7. Skin, and returns to its source within the soul, the sense of touch is lost.
By the light of the heart the soul leaves the body; and as the soul leaves, the powers of life follow.Since the soul is consciousness, the body loses consciousness as the soul departs; and the soul carries the spiritual effects of all that the person has done, experienced and known.

Brihadaranyaka Upanishad 4;3.35-36; 4.1-2