A pattern of slow brain waves:Alpha waves take place in normal people when they are at rest with closed eyes and thought by some to be associated with an alert but daydreaming mind.

The alpha rhythm is the normal brainwave in the electroencephalogram of a person who is awake and relaxed.
An alpha rhythm is a pattern of smooth, regular electrical oscillations in the human brain that occur when a person is awake and relaxed.

As recorded by the electroencephalograph, alpha waves have a frequency of 8 to 13 hertz.

In electroencephalography, the alpha rhythms,pertain to the rhythmic oscillations in electric potential occurring at an average rate of 10 per second.