I remember something Kenneth Folk had written on the Dharma Overground on how to check if you have dipped. Flutter you eye lids and watch for the last flutter and the end of the last sensation. I did this, the mind was immediately pulled into something unknown, there is a conk out (fruition) and a wave of bliss 3 seconds later. I also realise that I can will the mind into that build up of energy before that unknown moment in the conk out(fruition) and remain in it. I started meditating in it and I seemed to be powering through and the cycles got faster.
That's by Nikolai Halay on the Hamilton Project , and it also refers to this DhO thread and this Awake Network thread. I think there are some more references in his practice log and this thread. I think I'm working on second path and this doesn't work for me, but it might be interesting to try it out sometime at the end of a sit when you're feeling concentrated and relaxed. There seem to be a few different variations on whether you roll your eyes back before you flutter the eyelids, whether you focus on a point in the center of your head, etc.