Delta waves encompass all waves emitted from the brain in the range of zero to four hertz, and they are larger in amplitude than all of the other brain waves. Delta brain waves are emitted as a product of the brain's lowest level of functionality, a state of unconscious awareness. These waves are usually only found in people in deep REM sleep. There are techniques, however, that are known to be able to induce this delta mind state in the conscious mind.
Get a good night's rest
Get a good night's rest. Sleep is the most natural way to produce delta waves. Ensure that your sleep is uninterrupted by a snoring or tossing bed partner and is free from other distractions. These distractions prevent your mind from entering the delta mind state. Also, a rested mind is more able to focus and meditate to enter a conscious delta mind set.
Meditate to put your body
Meditate to put your body into a relaxed state. Meditation and breathing techniques can put your brain into a delta-like state. Some advanced meditators are said to produce delta waves when in a deep self-induced trance.
Begin a delta brainwave entertainment regimen
Begin a delta brainwave entertainment regimen. These programs, which can be found on the Internet, are designed to train the brain to produce delta waves in the conscious student. These programs generally use acoustic tones along with relaxing and breathing techniques to induce a delta state of mind.
Only those people in induced and non-induced comas are able to stay in a delta state of mind indefinitely.
The science behind conscious-state delta waves is non-existent. Most evidence is anecdotal.