Furthermore the level of Alpha waves was constant throughout the entire Yoga Nidra, while they came and went during the other relaxations. The balance between the EEG in the two brain halves was better in Yoga Nidra, which means that the two brain halves communicated better. These results were again confirmed in 1997 in the research you can read about in the following article. In training for relaxation. A study of response pattern of non-insulin dependent diabetics to yoga therapy.
Meditation improves clinicoelectroencephalographic measures in drug-resistant epileptics.
An outpatient program in behavioral medicine for chronic pain patients.