Somnology Somnology Somnology is the scientific study of sleep. It includes clinical study and treatment of sleep disorders and irregularities. Sleep medicine is a subset of somnology. After the invention of the EEG, the stages of sleep were determined in 1936 by Harvey and Loomis, the first descriptions of delta and theta waves were made by Walter and Dovey, and REM sleep was discovered in 1953. Sleep apnea was identified in 1965. In 1970, the first clinical sleep laboratory was developed at Stanford. The first actigraphy device was made in 1978 by Krupke, and continuous positive airway pressure therapy and uvulopalatopharyngoplasty
High-altitude adaptation in humans regulatory systems of oxygen respiration and blood circulation, when compared to the general lowland population. This special adaptation is now recognised as an example of natural selection in action. The adaptation account of the Tibetans has become the fastest case of human evolution in the scientific record, as it is estimated to have occurred in less than 3,000 years. Modern humans dispersed from Africa less than 100,000 years ago, and eventually colonized the rest of the world, including the harshest environments of extreme cold and high mountains. The abundance of oxygen in the atmosphere is inversely related to altitude from