Yep, sound's like nearly WILD to me. You were getting to the hypnotic imagery stage (something I've never experienced) If your alarm hadn't gone off and you had continued to remain focused you would have probably ended up in a dream fairly soon. Now that you've experienced this far it should be easier the next time. Just try going to bed earlier and then waking up earlier. It's very important not to get too freaked out by the imagery, and just passively watch it. Personally I have never gotten to this phase because I don't get out of bed...