Fortunately, I was stubborn enough not to listen to this voice. I moved through the rest of primary and did second up to pincha mayurasana; by the time I got through kapotasana, I was feeling great! (I mean, if kapo doesn't wake me up... I'm probably in serious trouble).
But the coolest thing in today's practice happened during the finishing sequence. Warning: I'm going to try to describe this experience in the plainest language, because I don't think there is any other way to do it justice. If you are the sort of person who is easily offended by, uh, plain language, please read no further. Consider yourself warned.
In urdhva padmasana in the shoulderstand sequence, I suddenly realized that I could really feel my mula bandha. I felt that some subtle layer of muscle between the genitalia and the anus was very subtly withdrawing into my body as I inhaled, and maybe withdrawing even more as I exhaled. At that very moment, I had this funny thought: It occurred to me that if I had a cervix, I would be contracting the cervix right at that moment. But of course I don't have a cervix, which is what made the thought weirder. I wonder if this means that females have a certain advantage over males in assessing mula bandha, just because for females, there is a precise anatomical point (the cervix) with which to locate mula bandha. If you don't know what I'm talking about, this might be helpful. Below is a diagram of mula bandha from Brook's mulabloga blog:
As Brooks helpfully notes, mula bandha is physically correlated with location (2), which is "the cervix, between the vagina and womb."
Interesting. This might be the closest I've ever gotten to having an out-of-body experience: In this case, I experienced what it might have been like to be in a female body, even if only for 10 breaths :-)
I can probably wax lyrical about this for a while, but I need to go prepare for class now. May the Force be with you.