Out-of–body-experiences are well documented these days and continue to provide evidence that this three dimensional material universe we find ourselves in, is just a fraction of our greater reality, and by attempting to comprehend that greater reality, for some of us - our physical lives take on more meaning. 

Black Elk, the famous native American Wičháša Wakȟáŋ (Medicine Man and Holy Man) began having visions (OBE’s) when at the age of nine he was suddenly taken ill and was unresponsive for several days. During this time he claimed he was visited by the Thunder Beings (Wakinyan), and taken to the Grandfathers — spiritual representatives of the six sacred directions: west, east, north, south, above, and below. These spirits were represented as kind and loving, full of years and wisdom, like revered human grandfathers.

When he was seventeen, Black Elk told a medicine man, Black Road, about the vision in detail. Black Road and the other medicine men of the village were “astonished by the greatness of the vision”

Here’s an example.

As I danced, with Good Thunder and Kicking Bear holding my arms between them, I had the queer feeling that I knew and I seemed to be lifted clear off the ground. I did not have a vision all that first day. That night I thought about the other world and that the Wanekia himself was with my people there and maybe the holy tree of my vision was really blooming yonder right then, and that it was there my vision had already come true. From the center of the earth I had been shown all good and beautiful things in a great circle of peace, and maybe this land of my vision was where all my people were going, and there they would live and prosper where no Wasichus were or could ever be.

“Before we started dancing next day, Kicking Bear offered a prayer, saying: ‘Father, Great Spirit, behold these people! They shall go forth today to see their relatives, and yonder they shall be happy, day after day, and their happiness will not end.’

“Then we began dancing, and most of the people wailed and cried as they danced, holding hands in a circle; but some of them laughed with happiness. Now and then some one would fall down like dead, and others would go staggering around and panting before they would fall. While they were lying there like dead they were having visions, and we kept on dancing and singing, and many were crying for the old way of living and that the old religion might be with them again.

“After awhile I began to feel very queer. First, my legs seemed to be full of ants. I was dancing with my eyes closed, as the others did. Suddenly it seemed that I was swinging off the ground and not touching it any longer. The queer feeling came up from my legs and was in my heart now. It seemed I would glide forward like a swing, and then glide back again in longer and longer swoops. There was no fear with this, just a growing happiness.

“I must have fallen down, but I felt as though I had fallen off a swing when it was going forward, and I was floating head first through the air. My arms were stretched out, and all I saw at first was a single eagle feather right in front of me. Then the feather was a spotted eagle dancing on ahead of me with his wings fluttering, and he was making the shrill whistle that is his. My body did not move at all, but I looked ahead and floated fast toward where I looked.

“There was a ridge right in front of me, and I thought I was going to run into it, but I went right over it. On the other side of the ridge I could see a beautiful land where many, many people were camping in a great circle. I could see that they were happy and had plenty. Everywhere there were drying racks full of meat. The air was clear and beautiful with a living light that was everywhere. All around the circle, feeding on the green, green grass, were fat and happy horses; and animals of all kinds were scattered all over the green hills, and singing hunters were returning with their meat.

“I floated over the tepees and began to come down feet first at the center of the hoop where I could see a beautiful tree all green and full of flowers. When I touched the ground, two men were coming toward me, and they wore holy shirts made and painted in a certain way. They came to me and said: ‘It is not yet time to see your father, who is happy. You have work to do. We will give you something that you shall carry back to your people, and with it they shall come to see their loved ones.’

“I knew it was the way their holy shirts were made that they wanted me to take back. They told me to return at once, and then I was out in the air again, floating fast as before. When I came right over the dancing place, the people were still dancing, but it seemed they were not making any sound. I had hoped to see the withered tree in bloom, but it was dead.

“Then I fell back into my body, and as I did this I heard voices all around and above me, and I was sitting on the ground. Many were crowding around, asking me what vision I had seen.

Source:

http://en.wikipedia.org/wiki/Black_Elk
Black Elk Speaks