Lately I've been busy reading Mastering the Core Teachings of the Buddha by Daniel Ingram. This book is available free online at MCTB.org and you can also get an idea of his thoughts through his several talks on YouTube. One I found particularly interesting was done with with Guru Viking and the subject is about various aspects of magic. [MEDIA=youtube]Dd79YHBhWNE[/MEDIA]

Anyway, Mr. Ingram is a proponent of a fire kasina practice. In nutshell, you stare in to a candle flame and meditate on the after image to access altered states of mind. In the book he also goes into length to discuss the nimitta phenomenon not limited to the fire kasina practice, but familiar to all deeper meditative stages. That is the sort of light you begin to see behind your eyelids, even when in complete darkness when you are about to enter the deeper meditative states.

The way writes about these phenomena is very reminiscent of the onset of a DMT experience. Unfortunately I have not yet done much work to cultivate these techniques, but I believe there is lot of potential in the instructions of Mr. Ingram to cultivate meditative states under the influence of DMT.

Here is an excerpt from the section 29. "Kasinas". Emphasis is mine.

The whole book is very valuable but from the point of view of having a parallel to the DMT experiences, this above quoted chapter is worth going through.