Normal human body temperature, also known as normothermia or euthermia, is a narrow temperature range indicating optimal health and thermoregulation. Individual body temperature depends upon the age, exertion, infection, sex, time of day, and reproductive status of the subject, the place in the body at which the measurement is made, the time of day, the subject's state of consciousness (waking or sleeping), activity level, and emotional state. Despite these factors, typical values are well established: oral (under the tongue): 7002309950000000000♠36.8±0.4 °C (7002309927777777777♠98.2±0.72 °F),[7] internal (rectal, vaginal): 37.0 °C (98.6 °F).[7]