Brainwaves  are the combination of electrical activity taking place in the brain due to brain cells using electricity to communicate. It is the combination of neuronal activity that makes for brainwave patterns. A brainwave pattern has  electrical activity with cyclic “wave-like” motions. Brainwave patterns include two or more neurons (usually many) oscillating synchronously. Synchronistic in the sense that left-right hemispheres together can generate brain waves. Importantly, brainwave patterns can be generated pan-environmentally —> by an internal environmental or external environmental  stimulus. Brain activity is recorded according to the reaction to this stimulus. Human mind-body input can slow down or increase brain activity. Brainwave activity that significantly slows down is probably indicating REM sleep (REM sleep is deep sleep). Deep sleep is vital for both brain and body health. Sleep research suggests that we need a minimum of 7-8 hours of sleep each night. When brain activity picks up there is an increase in brain consciousness, awareness, comprehension, and hopefully useable knowledge (review CACK Model).