“Yogis say that long hair draws more energy to the brain. They describe the body as an inverted tree of which the spine is the trunk, the nervous system the branches, and the hair the roots. This is why many yogis let their hair grow long.”
You may meditate on this interesting explanation by Yogananda: “The hair is more on the head because that is where the seat of energy is.
“Some yogis do not cut their hair but keep it long, to draw from the ether a greater quantity of cosmic rays. The reason for Samson’s having lost his superhuman strength when his hair was shorn by Delilah may well be that he had practiced certain yogic exercises that transform one’s hair into sensitive antennae to draw cosmic energy from the ether.”
Om Namah Shivay