Somnology they may work well in treating insomnia, have a risk of abuse which is why these treatments are not the first resort. Some sleep disorders such as narcolepsy do require pharmacological treatment. 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
Sexual differentiation in humans evidence: animal research involving manipulation of hormones in early life, observation of outcomes of small numbers of individuals with intersex conditions or cases of early sex reassignment, and statistical distribution of traits in populations (e.g., rates of homosexuality in twins). Many of these cases suggest some genetic or hormonal effect on sex differentiation of behavior and mental traits this has been disputed as poor interpretation of scientific methodology. The following are some of the variations associated with atypical determination and differentiation process: Sexual differentiation in humans Sexual differentiation in humans is the process of development of sex differences in humans.