A very important Power Yoga teacher attended my workshop once ( I assume that she was important, going by the attitude of disdain she carried with her, as some of the new-fangled yoga teachers do these days, ha ha:) . She came with an assistant and then left, with a smirk, when I settled the class for nidra, indicating that the practice was below the dignity of a power yoga teacher. Apparently, and I have written a bit about this, that in some power yoga classes the participant is asked to go home and do nidra!!!! That is so asinine -- the sort of comic-tragic things u hear from some yoga classes these days.
A long nidra can be the most important thing a yoga teacher did after an intense class. A nidra needs a lot of meditative energy from a teacher (which may explain why most teachers are incapable of that). It is not just a transcript. Or about just lying down. Or else, why would classical texts describe the Shavasana (the base pose for nidra) as a third-eye practice?
Below I give you a link from Life Positive Online, for a column I did on this subject.
Classical yoga prescribes a period of rest between intense holds in each pose. The reason for the rest breaks is that after any intense physical activity there is a build-up of lactic acid in the blood. It is a natural byproduct of the release of glucose for muscular effort.
And there is a special reason I have used this image of Kali dancing on her supine lord. Here is Devdutt Pattanaik's erudite explanation on that. I have just excerpted a little from the link I have attached below, so those of you who do not know the story behind the dance may be lost. It is better u read that.. here I am just giving you Pattanaik's connection and interpretation of that dance. I give it here because, it sort of weaves in this connection between the mind and the body that seems so difficult for people to make, when they come to yoga..