when does body temperature tend to be lowest
11 p.m. to 3 a.m.
title: Human body temperature text: temperature also changes when a person is hungry, sleepy, sick, or cold. Body temperature normally fluctuates over the day following Circadian rhythms, with the lowest levels around 4 a.m. and the highest in the late afternoon, between 4:00 and 6:00 p.m. (assuming the person sleeps at night and stays awake during the day). Therefore, an oral temperature of would, strictly speaking, be a normal, healthy temperature in the afternoon but not in the early morning. An individual's body temperature typically changes by about between its highest and lowest points each day. Body temperature is sensitive to many hormones, so women title: Human body temperature text: body's core temperature rises to a higher temperature through the action of the part of the brain that controls the body temperature; with hyperthermia, the body temperature is raised without the influence of the heat control centers. In hypothermia, body temperature drops below that required for normal metabolism and bodily functions. In humans, this is usually due to excessive exposure to cold air or water, but it can be deliberately induced as a medical treatment. Symptoms usually appear when the body's core temperature drops by below normal temperature. Basal body temperature is the lowest temperature attained by the body during title: Human body temperature text: of these averages as representing normal or ideal measurements, a wide range of temperatures has been found in healthy people. The body temperature of a healthy person varies during the day by about with lower temperatures in the morning and higher temperatures in the late afternoon and evening, as the body's needs and activities change. Other circumstances also affect the body's temperature. The core body temperature of an individual tends to have the lowest value in the second half of the sleep cycle; the lowest point, called the nadir, is one of the primary markers for circadian rhythms. The body title: Lowest temperature recorded on Earth text: Lowest temperature recorded on Earth The lowest natural temperature ever directly recorded at ground level on Earth is at the Soviet Vostok Station in Antarctica on July 21, 1983 by ground measurements. On August 10, 2010, satellite observations showed a surface temperature of at , along a ridge between Dome Argus and Dome Fuji, at elevation. The result was reported at the 46th annual meeting of the American Geophysical Union in San Francisco in December 2013; it is a provisional figure, and may be subject to revision. The value is not listed as the record lowest temperature as it was title: Human body temperature text: have a temperature rhythm that varies with the menstrual cycle, called a "circamensal" rhythm. A woman's basal body temperature rises sharply after ovulation, as estrogen production decreases and progesterone increases. Fertility awareness programs use this change to identify when a woman has ovulated in order to achieve or avoid pregnancy. During the luteal phase of the menstrual cycle, both the lowest and the average temperatures are slightly higher than during other parts of the cycle. However, the amount that the temperature rises during each day is slightly lower than typical, so the highest temperature of the day is not very