Dumb, joke ES thought I had a few days ago: Izmeron gets insomnia for a week or two and can't dream of the future. Force, on the other hand, manages to keep sleeping and dreaming of the past, and finally manages to find her, for good or ill.
CherryFlight: Ah, alright then! I figured it couldn't happen since I wasn't sure whether or not Izmeron (or even Force, really), needed to sleep, but I didn't know that it couldn't happen because they could access their powers while they were awake.
If he zones out, I imagine it's more of a 'not focusing on what's going on around me because I'm trying to pay attention to this vision' kind of zoning out instead of just falling asleep.