Is it accurate to take a temperature just after waking up? We take body temperature in the normal temperature and environment, so the environment of waking up and sleeping to take body temperature is not too much change. The temperature of a normal person is 36.1℃ to 37℃ under the armpit, and it is accurate to measure it when you are sleeping or just waking up. There are also oral temperature measurement, there are not too many environmental restrictions that affect the accuracy of the temperature measurement, its normal value is in 36.3 ℃ – 37 ℃. The normal value is 0.3℃-0.5℃ higher than our oral temperature.