In this paper the Heisenberg's uncertainty principle is applied to the study of the quantum nature of the brain waves. Considering our model for the brain quanta the Libet's time for the human brain is calculated. The value 0.45 s is obtained which is in good agreement with the measured value (1.4 s). In the paper we calculated the temperature of the source of the photons located in human brain. It is well known that our space time is filled with Cosmic Background radiation. It was interesting

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... o calculate the temperature of the Cosmic Background radiation source with the same model as for brain photons. As the result the shape of temperature was calculated, T=2.53 K, which is in very good agreement with observed value.