Did you experience an overwhelming feeling of energy, perhaps intensely pleasurable, in the spine and brain? Could you percieve the chakras and their precise locations? Any perceptions of internal light or sound? These are a few things that I'd be inclined to associate with the rousing of kundalini.
I felt no internal light, nor did I perceive the chakras and their locations - but an overwhelming feeling of intensely pleasurable energy is spot on.
While almost every meditation session during a couple of weeks leading up to this experience were pleasurable and gave me energy, there was a particular session/moment that stands out as markedly special.
I woke up in the early morning hours without having set an alarm, and instead of trying to go back to sleep or enter normal waking consciousness and do something like turn on the light and read a book, I immediately started to do slow mindfulness so as not to disturb the mind. I performed each motion of getting out of bed very slowly and deliberately, focusing my attention on the movement of each section of the body. I walked from the bedroom into the study using walking meditation Thich Nhat Hanh style, sat down in my chair and did sitting anapanasati (breath focusing) meditation for what felt like 30 minutes or so.
I then got up and started to do stretching with pranic breathing (I had not been doing proper yoga practice before, but my voice coach had taught me stretching with pranic breathing in order to help me release tensions that blocked my progress in singing). I did a few different stretching exercises, and at this point I was completely in the now and in the flow, time perception was completely gone, all that was left was awareness and the sensations and sounds of each deep breath.
I stretched down toward my feet, gradually increasing the stretch for each in breath, and consolidating with each out breath. I have no idea for how long I did this, but when I finally stood up again and my back straightened, there was a sensation of energy rushing up my spine simultaneously with a WHOOOOOOOOSH sound that seemed extremely loud but I think must have been internal. My entire body started to tingle with energy and the effects I described above started to arise.
So in short, I recall no no internal light, nor any perception of any chakras or their positions (I didn't know chakra theory at that point), but the other things you mentioned were there.
Edited by Godof Smallthings, 08 January 2013 - 01:54 PM.