Mind machines are tools that help you enter altered states of consciousness (also called neurotechnology, or psychotechnology). Primarily, the term "mind machine" refers to light & sound machines, but also includes a broader range of tools like biofeedback devices, sleep & lucid dreaming tools, and binaural beat technology like Hemi-Sync. These cutting edge devices are rapidly becoming tools of choice to explore beginning or advanced meditation, self hypnosis, sleep and dream enhancement, learning, consciousness expansion, or stress management and more.