"Various methods are used to achieve the level of oxygen depletion needed, such as a hanging, suffocation with a plastic bag over the head, self-
strangulation such as with a
ligature, gas or volatile solvents, chest compression, or some combination of these.Sometimes, complicated devices are used to produce the desired effects.
"
"When the brain is deprived of oxygen, it induces a lucid, semi-hallucinogenic state called hypoxia. Combined with orgasm, the rush is said to be no less powerful than cocaine, and highly addictive".