Sri Aurobindo
Letters of Sri Aurobindo
Volume III - Part 2
Fragment ID: 12258
There is no criterion [for distinguishing visions from dreams of a deeper origin], but one can easily distinguish if one is in the inward condition, not sleep, in which most visions take place by the nature of the impression made. A vision in dream is more difficult to distinguish from a vivid dream-experience, but one gets to feel the difference.