The document discusses various states of consciousness, including normal waking consciousness and altered states induced by drugs, meditation, hypnosis and other means. It covers theories of consciousness such as Freud's view of dreams representing unconscious desires. Various sleep stages and disorders are outlined as well as biological rhythms like circadian and ultradian rhythms. Drugs that induce different states like depressants, stimulants, psychedelics and marijuana are described along with theories of addiction. Different types of meditation practices and hypnosis are also summarized.