A lucid dream is induced in a subject. A brain state entrainment signal is generated in a circuit. A transducer applies a waveform of a kind sufficient to cause a lucid dream in the brain based on the brain state entrainment signal. The brain state entrainment signal modulates a carrier wave of a higher frequency than the entrainment frequency. The waveform is first applied to the subject and thereafter removed to attempt a lucid dream. The waveform can be electrical, light, sound or magnetic waveforms.