A teacher of neigong said:
For the neigong we do, brain activity approaches zero and yes, we can do that almost instantly and I have proven this in a sleep lab, but natural awareness increases.
Milton Erickson also described an increase of awareness in trance:
I go into trances so that I will be more sensitive to the intonations ...


Gautama mentions extending the mind of compassion in the ten directions to infinity, and says the perfection of such an extension is the realm of infinite ether (the first arupa jhana, or immaterial trance).