if i remember correctly. the nightmare in the ruins occurs after sleeping with Rhot several times, keep on resting afterwards, and it would be triggered..
I see...so sex was the answer this whole time! I'll try it!
Day 14: The lizard tribe has begun to think that i'm in a coma. I have yet to have a nightmare and the only proof that i'm alive is the fact that i keep having sex with a lizard every night.
Ah, I think I may have found the issue. The gems used in the ritual involving Naxus are referenced in a following conversation. Since I hadn't done that quest yet, that's probably why I won't have the nightmare.