The phrase "brain waves" refers to the electrical signals that your brain creates. These signals are like little waves that help doctors and scientists understand how your brain works and what you are thinking or feeling. Full definition
There are clear patterns of brain wave activity, hormone production, cell regeneration and other biological activities linked to this daily cycle. (sciencedaily.com)
Love is a a biological reaction, complete with chemical interactions and can be measured in brain wave patterns. (religion.blogs.cnn.com)
He has measured brain waves in sleeping fruit flies, identified genes that are active in humans during sleep, and demonstrated that sleep enhances learning and memory. (discovermagazine.com)