Correlation between different brain waves energy and hypnosis has been investigated in this study. Using empirical mode decomposition algorithm, the EEG signals of 32 subjects with different hypnotizability levels have been decomposed into different frequency bands and then the energy of these frequency bands is calculated using Hilbert transform. Statistical tests show that the effect of the hypnosis suggestion and hypnotizability on brain wave relative energy in delta band is opposite of beta band. It was also resulted that hypnosis is not a sleep and the brain is in conscious state in hypnosis.