I had very few experiences with dreams. Don’t mistake me, I do have aspirations and visualize them when I am fully awake. I often don’t sleep until I am so tired, maybe that’s the reason. As usual, I searched (rather than googled) and found some interesting articles on brain waves. The final answer to dreamless sleep is that one would be reaching a state where his/her brain is generating higher amplitude and low-frequency waves and this is the lowest frequency that one could achieve while alive. The explanation of different brain waves mentioned in the article is as follows:
When the brain is aroused and actively engaged in mental activities, it generates beta waves. These beta waves are of relatively low amplitude and are the fastest of the four different brainwaves. The frequency of beta waves ranges from 15 to 40 cycles a second. Beta waves are characteristics of a strongly engaged mind. A person in active conversation would be in beta. A debater would be in high beta. A person making a speech, a teacher, or a talk show host would all be in beta when they are engaged in their work.
The next brainwave category in order of frequency is alpha. Where beta represented arousal, alpha represents non-arousal. Alpha brainwaves are slower, and higher in amplitude. Their frequency ranges from 9 to 14 cycles per second. A person who has completed a task and sits down to rest is often in an alpha state. A person who takes time out to reflect or meditate is usually in an alpha state. A person who takes a break from a conference and walks in the garden is often in an alpha state.
The next state, theta brainwaves, are typical of even greater amplitude and slower frequency. This frequency range is normally between 5 and 8 cycles a second. A person who has taken time off from a task and begins to daydream is often in a theta brainwave state. A person who is driving on a freeway, and discovers that they can’t recall the last five miles, is often in a theta state–induced by the process of freeway driving. The repetitious nature of that form of driving compared to a country road would differentiate a theta state and a beta state in order to perform the driving task safely.
The final brainwave state is the delta. Here the brainwaves are of the greatest amplitude and slowest frequency. They typically center around a range of 1.5 to 4 cycles per second. They never go down to zero because that would mean that you were brain-dead. But, deep dreamless sleep would take you down to the lowest frequency. Typically, 2 to 3 cycles a second.
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