Delta waves (0.5-4 Hz) signify a state of deep sleep. A binaural beat with a frequency between 4 and 7 Hz, for example, is more likely to align with theta brain waves, promoting sleep and relaxation.
On April 2, 2001, Bret Boone jogged to second base for a chilly Opening Day in Seattle. The roof at Safeco Field was open, the upstart Oakland Athletics were in town, and ESPN2 had the national ...