As a person falls into a deep sleep, the progression of brain waves seen on the EEG starts with waves, followed by waves, then waves.

As a person transitions into deep sleep, the progression of brain waves observed on an electroencephalogram (EEG) typically follows this sequence:

1. Alpha Waves (8-12 Hz): These waves are predominant when a person is awake but relaxed, often with closed eyes. They are associated with a state of calmness and readiness for sleep.

2. Theta Waves (4-7 Hz): As a person begins to fall asleep, the brain shifts from alpha to theta waves. This stage represents light sleep and is characterized by drowsiness, where the person may still be easily awakened.

3. Delta Waves (0.5-4 Hz): Finally, during deep sleep (also known as slow-wave sleep), delta waves become dominant. These waves indicate the deepest state of rest and are essential for restorative processes in the body.

This progression is crucial for understanding the various stages of sleep and their impact on overall health and well-being.