Short term Deprivation is a common way of undermining the Bodily Ego and inducing a Connection Experience, especially amongst ingigenous populations and those who follow a Shamans path.
List of Connection Practices
Connection Practice > Hypnotism
"Among some Inuit of the Arctic, one way to have a successful quest for power was to spend four or five days in a special isolated igloo in the depths of winter without food or water. When the specified time elapsed, an elder, usually a shaman, opened the igloo and brought the person home. The igloo did not have even an oil lamp to heat it, so the suffering from extreme cold was combined with suffering from lack of water and food."
The Achomwi and Hat Creek natives of California use fasting, sleep deprivation to induce shamanic dreaming. 
- ↑ Harner, Michael. Cave and Cosmos: Shamanic Encounters with Another Reality. Berkeley, California: North Atlantic Books, 2013.
- ↑ Dixon, Roland B. “Some Shamans of Northern California.” The Journal of American Folklore 17, no. 64 (1904): 23. https://doi.org/10.2307/533984.